JBL's Duet II can't pump out loads of bass or volume, and don't have many options, but if you want detailed audio without giving up much desk space, the Duet II is worth a look.
Short version: An alright set of $99 computer speakers that, while lacking a dedicated subwoofer, do produce good lows as well as good highs.
JBL Duet II
CD 220
XPS 510
CM3T
BR367AA
Hello Kitty
S-260