My OS X boot drive (Panther) went from 1.2 GB free down to 750 and now just 500 MB. I've only created <100 MB of new data recently. I checked my Logs, Caches, App Support, and Prefs folders, but none of them had grown really large. I checked those folders for my user account AND my root Library AND System/Library. Biggest was System/Library/Caches at 150 MB--the other folders showed 20 MB or less in Get Info. I searched Everywhere for invisible files >100 MB and found none. (But that search wouldn't catch masses of SMALL files.) Now I've run disk repair just in case, and rebooted (which sometimes frees up a little space). Didn't help. My only lead: Photoshop did crash on me once recently. I made sure to Purge it at next launch, in the hopes that it might clean up some leftover scratch data. But I don't really know where it stores its scratch data--where should I look? I'm running low and can't seem to find the space-hogging culprit! Thanks for any ideas.