thttpd is a must!!!
I've just installed thttpd for static files (webpage objects like images, javascripts...)It really really rocks, right now there're ~160 connections leeching a ~500MB file (WindowsXP SP2 ISO), and it use up 0.5% CPU

Plus, it can throttle outbound bandwidth to a limited value you can set, so you won't have to worried about your bandwidth bill

Oh, forgot to mention that all of my site's images/javascript/css are now hosted with thttpd, it help the server load drop from about 2.4 to 1.8 at peak time. It's today stat so maybe it won't help that much, but maybe it will help more
