lsusb

Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 003: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 002: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 012: ID 2040:4901 Hauppauge 
Bus 001 Device 011: ID 2040:4902 Hauppauge 
Bus 001 Device 004: ID 2001:f103 D-Link Corp. [hex] 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

ls -la /dev/ttyS* /dev/ttyU*

crw-rw---- 1 root uucp   4, 64 2009-11-11 19:52 /dev/ttyS0
lrwxrwxrwx 1 root root      12 2009-11-12 10:12 /dev/ttyS1 -> /dev/ttyUSB0
crw-rw---- 1 root uucp   4, 65 2009-11-11 19:52 /dev/ttyS1_bck
lrwxrwxrwx 1 root root      12 2009-11-12 10:12 /dev/ttyS2 -> /dev/ttyUSB1
crw-rw---- 1 root uucp   4, 66 2009-11-11 19:52 /dev/ttyS2_bck
crw-rw---- 1 root uucp   4, 67 2009-11-11 19:52 /dev/ttyS3
crw-rw---- 1 root uucp 188,  0 2009-11-12 10:45 /dev/ttyUSB0
crw-rw---- 1 root uucp 188,  1 2009-11-12 10:08 /dev/ttyUSB1

lshw

        *-usb:0
             description: USB Controller
             product: 82801G (ICH7 Family) USB UHCI Controller #1
             vendor: Intel Corporation
             physical id: 1d
             bus info: pci@0000:00:1d.0
             version: 01
             width: 32 bits
             clock: 33MHz
             capabilities: uhci bus_master
             configuration: driver=uhci_hcd latency=0
             resources: irq:21 ioport:ff80(size=32)
           *-usbhost
                product: UHCI Host Controller
                vendor: Linux 2.6.27.38-170.2.113.fc10.i686 uhci_hcd
                physical id: 1
                bus info: usb@5
                logical name: /dev/usb5
                version: 2.06
                capabilities: usb-1.10
                configuration: driver=hub slots=2 speed=12.0MB/s
        *-usb:1
             description: USB Controller
             product: 82801G (ICH7 Family) USB UHCI Controller #2
             vendor: Intel Corporation
             physical id: 1d.1
             bus info: pci@0000:00:1d.1
             version: 01
             width: 32 bits
             clock: 33MHz
             capabilities: uhci bus_master
             configuration: driver=uhci_hcd latency=0
             resources: irq:22 ioport:ff60(size=32)
           *-usbhost
                product: UHCI Host Controller
                vendor: Linux 2.6.27.38-170.2.113.fc10.i686 uhci_hcd
                physical id: 1
                bus info: usb@6
                logical name: /dev/usb6
                version: 2.06
                capabilities: usb-1.10
                configuration: driver=hub slots=2 speed=12.0MB/s
        *-usb:2
             description: USB Controller
             product: 82801G (ICH7 Family) USB UHCI Controller #3
             vendor: Intel Corporation
             physical id: 1d.2
             bus info: pci@0000:00:1d.2
             version: 01
             width: 32 bits
             clock: 33MHz
             capabilities: uhci bus_master
             configuration: driver=uhci_hcd latency=0
             resources: irq:18 ioport:ff40(size=32)
           *-usbhost
                product: UHCI Host Controller
                vendor: Linux 2.6.27.38-170.2.113.fc10.i686 uhci_hcd
                physical id: 1
                bus info: usb@7
                logical name: /dev/usb7
                version: 2.06
                capabilities: usb-1.10
                configuration: driver=hub slots=2 speed=12.0MB/s
        *-usb:3
             description: USB Controller
             product: 82801G (ICH7 Family) USB UHCI Controller #4
             vendor: Intel Corporation
             physical id: 1d.3
             bus info: pci@0000:00:1d.3
             version: 01
             width: 32 bits
             clock: 33MHz
             capabilities: uhci bus_master
             configuration: driver=uhci_hcd latency=0
             resources: irq:23 ioport:ff20(size=32)
           *-usbhost
                product: UHCI Host Controller
                vendor: Linux 2.6.27.38-170.2.113.fc10.i686 uhci_hcd
                physical id: 1
                bus info: usb@8
                logical name: /dev/usb8
                version: 2.06
                capabilities: usb-1.10
                configuration: driver=hub slots=2 speed=12.0MB/s
        *-usb:4
             description: USB Controller
             product: 82801G (ICH7 Family) USB2 EHCI Controller
             vendor: Intel Corporation
             physical id: 1d.7
             bus info: pci@0000:00:1d.7
             version: 01
             width: 32 bits
             clock: 33MHz
             capabilities: pm debug ehci bus_master cap_list
             configuration: driver=ehci_hcd latency=0
             resources: irq:21 memory:ffa80800-ffa80bff
           *-usbhost
                product: EHCI Host Controller
                vendor: Linux 2.6.27.38-170.2.113.fc10.i686 ehci_hcd
                physical id: 1
                bus info: usb@1
                logical name: /dev/usb1
                version: 2.06
                capabilities: usb-2.00
                configuration: driver=hub slots=8 speed=480.0MB/s
              *-usb:0
                   description: Generic USB device
                   product: Hauppauge HD PVR
                   vendor: AMBA
                   physical id: 2
                   bus info: usb@1:2
                   version: 0.00
                   serial: 00A2846A
                   capabilities: usb-2.00
                   configuration: driver=hdpvr maxpower=4mA speed=480.0MB/s
              *-usb:1
                   description: Generic USB device
                   product: Hauppauge HD PVR
                   vendor: AMBA
                   physical id: 5
                   bus info: usb@1:5
                   version: 0.00
                   serial: 00A29347
                   capabilities: usb-2.00
                   configuration: driver=hdpvr maxpower=4mA speed=480.0MB/s
              *-usb:2
                   description: USB hub
                   vendor: D-Link Corp. [hex]
                   physical id: 6
                   bus info: usb@1:6
                   version: 1.00
                   capabilities: usb-2.00
                   configuration: driver=hub slots=7 speed=480.0MB/s