Here is the Official Ubuntu Wireless Documentation
Cards Supported
https://help.ubuntu.com/community/WifiDocs/WirelessCardsSupported
Troubleshooting/Howto/General
https://help.ubuntu.com/community/WifiDocs/WiFiHowTo
In the event of your Wifi card being unsupported you can use Ndiswrapper Here is the Official Ubuntu Ndiswrapper Documentation
https://help.ubuntu.com/community/WifiDocs/Driver/Ndiswrapper
Run Ubuntu 7.04 (Feisty Fawn) on PS3
http://forums.afterdawn.com/thread_view.cfm/512082
It should be noted that although it is probably the best release ever of the distro. Ubuntu 7.04 is now two years old and no longer supported
I thoroughly recommend you carry out a clean installation of the latest release Ubuntu 9.04 which is quite outstanding furthermore there is a dedicated PS3 download available (select PlayStation 3 desktop CD)
http://cdimage.ubuntu.com/ports/releases/jaunty/release/
How To Install Ubuntu 9.04 on PS3
http://www.itechni.com/?p=155
LUg.