XFX R7860. Not exactly old, but it's still decently powerful for being an almost decade old card (+ really nice looking).
MSI 865PE Neo 2-V W/ A Pentium 4 3.20GHz / 1M / 800. I sorta wanna sell this seeing the price it's going for, but at the same time, I'd wanna hang it on a wall. I just love how colorful it is.
Dell Latitude D360. I really, really love this thing, mostly because my parents had one (or one very similar. Can't remember, and neither can they). I'm missing a battery for it, though, which is extremely unfortunate, because I'd daily carry this thing. Sure, it's not very powerful, but it's still good for stuff like web surfing or text editing. This thing to me, is what the Thinkpad is to many of you.
I know these aren't exactly old, or retro at all, but I still felt like these belonged here.