This is probably a borderline topic for the Collector's Database are, but I'll try here first because I'm not sure.
Anyways, how does everyone keep track of what games they have, without digging through the proverbial archives? Do you use the DP Guides (of which one is sold out at the moment)? The online guide? Something else? It's partly curiosity on my part, but also because I'd like to know if anyone has ever concocted a program to do just this (and for the Mac OS, too).