Pitchfork
Music news website - they cover every kind of indie music there is... as long as the kids are listening to it, it will be on Pitchfork
Myspace
If you ever need to hear what a band/performer sounds like, look for them on myspace.com!
CD Baby
You can find a lot of hard to find albums on CD Baby - they have loads of indie-folk musicians on here with comprehensive bios and sound clips
Paste Magazine
Great resource for new music! The Magazine comes with a sampler CD every 2 months. Also they have coverage on culture, books, film and technology