<3 Duke Nukem. This guy has some pretty good covers of some old video games.
http://www.youtube.com/watch?v=g-y0MdPXslo
The funny thing is, most technical death metal bands and such sound exactly like 80's and early 90's videogames when their music is mixed to sound like 8-bit or 16-bit.
Anyway, many soundtracks to videogames are amazing: I just adore Harry Gregson-Williams's, Nobuo Uematsu's and other composers' works.
Speaking of death metal and video games...
http://www.youtube.com/watch?v=98ew0VtHmik