This is a compilation of the best chiptune songs. 

Blog post about the music (hungarian language): http://numlockholmes.blog.hu/2010/08/28/8_bites_zene (magyar nyelv)



All of the songs (and more) can be found at this site, in special file format: 
http://keygenmusic.net/

You can download here a freeware player program, for this special format (also you can convert to mp3 with this):
http://www.modplug.com/


There are some interesting online chiptune radio stations:
http://kohina.com/
http://nolife-radio.com/