It depends on my mood.

Generally, I don't like what they play on commercial radio stations though occasionally something I like gets played there.

One of my favorite internet radio stations was Evil Robot Radio but they failed to pay their bills and so they are no longer accessible.

I like some fairly mainstream accessible artists such as Steve Wonder, Prince, or Jimi Hendrix but I tend to be more interested in stuff that is less well known.

On live365, I recommend the Cosmic Goof and Math Books and 88mms as two of the stations I find myself listening to often. Warning: the latter is pretty intense and potentially offensive at times.

On Australian public radio there are some really good music programs with streaming archives such as 'the Night Air, 'Sound Quality', and 'Quiet Space'. I like listening to stuff like that when I want to relax and/or when I have work to do.