Not really a "dumpster find" but saved from a dumpster - got a couple towers from a coworker.
A slim desktop with a decent looking Socket "A" Asrock K7VM2, with I believe some custom software onboard. Not sure what CPU just yet, 120 GB Samsung hard drive. Board has Windows 98/ME drivers available direct from Asrock, which is nice. Might make a decent late ME machine.
Also an LGA775 based Acer desktop in nice shape. Q6600 and 2 GB of RAM, if the sticker on the front is to be believed. Borderline retro, but I might be putting my spare Geforce 460 into it and making it a super-low-end gaming PC for my wife's nephews. Not sure how much it'll really handle but seems that if I bump it up to a Q6700 and 4GB of RAM, along with the 460 it'll still game decently on low for things that don't require the newest instruction sets.
Pictures to come later, I've only had a chance to quickly see at least the basics of what's there but actually doing anything will have to wait until my son is asleep 😀