How to record an audio stream from off the internet (Sticky Fodder)

Hi all, I'm new here and am interested in being able to use Audacity to record an audio stream from off the internet. I play bass in a cover band, and we need some new material- I though going to youtube and recording some stuff off there might be handy.

Yesterday I hooked up a small Yamaha mixer to my stereo- I routed from the computer's Soundmax Digital soundcard to the mixer; then I sent two sets of signals out to the stereo- one to the reciever to hear the tunes, another to a cassette recorder for capture.

I'd rather do it digitally of course, as the cassette machine is an old Optimus gadget... it plays alright, but it's not a great recorder. Today I hooked up my old Tascam US-428 (a USB device) to the computer and am now using it as my only soundcard.

Can I get a quick run-down of how to route the sound coming into the computer through my Tascam US-428, and into Audacity (or Cool Edit, etc)? Thank you for your time and trouble!

Rog.

Freecorder. Rocks.