There are a few pretty good music samplers offered online right now. The first is from Pitchfork Media. They're holding the second annual Pitchfork Music Festival this summer. The sampler offers a song from most every act performing at this year's festival including Animal Collective, Cut Copy, and The Dodos.
Check out and download all 25 tracks from Pitchfork here.
Also, Girl Talk's record label, Illegal Art, is offering a new music sampler. Girl Talk actually has an album being released on Illegal Art's website Radiohead-style (pay-what-you-want) tomorrow or shortly after. The sampler doesn't include new material off of Girl Talk's new album, titled Feed the Animals (that's the cover art above), but it does include a song from an out-of-print compilation album. You can't find this track anywhere else.
Check out Girl Talk and the rest of the sampler here. Also, for Girl Talk's new album, keep checking back at Illegal Art's website here.