Obviously, I spend a lot of time involved in the video game music rearrangement community, but netlabels feature great collectives of talent doing original music as well.
Like any hobbyist initiative, productivity can sometimes be intermittent. My favorite netlabel Hellven, run by Xavier "mv" Dang, has stopped and started on several occasions. This makes it difficult to find a really steady source of content to satisfy your fix.
On the chiptune side, Audun "AkumuHau" Sorlie, keeper of the most comprehensive NSF collection out there (and the only other guy I know who's listed his hobbies as "VG, Wrestling, Comics" in that order), has been pimping the latest chiptune netlabel, II (i.e. Pause). Norrin Radd and Shawn Phase are there. I'll be checking out their other material in the near future, but check out this cover art hotness for Radd's album, Melodia di Infinità.
That art's good enough to hang on your wall.