Linux for audio recording

[Bart Silverstrim]

Anyone try setting up a Linux workstation for recording something like, 
say, podcasts?  Could you describe your setup if you have?

Can you make use of a decent USB microphone to record?  Or more than one?

What software do you use to mix and edit audio?

What about recording audio conferences for remote users/guests, like 
using skype?  Are there other applications for audio/video chat that can 
be recorded? (I don't know the status of skype on Linux)