Just finished up my Dayton Audio DTA-1 Video review review. The DTA-1 is a Class T amplifier which is very efficient, but not at the cost of sound quality. I use one at home in my computer setup, as well as at work. I even replaced my NAD with one of these suckers...just don't tell NAD that. :)
Anyways, amazing amp for the money ($30-$40) and for any of you looking to get a small, inexpensive desktop amp for your computer setup or any other small space, I highly recommend looking into the DTA-1. It even runs on AA batteries!
Link: http://www.youtube.com/watch?v=FKmCMnt57kw
-Davy
