For a few hours this afternoon, my powerbook was acting wierd. The fans were running like crazy and the only thing open was safari (a few windows), mail, and iChat. Safari was unbearably slow. When I went to activity monitor, my processor was running at almost 100%, but I couldn't find the culprit, the biggest resource hog was safari and it was only 5-10%... Quitted everything, left computer for a while. Come back, fans still running, and message comes up saying I'm out of hard disk space. I ran onyx: all the maintenance and cleaning commands, restart and reset pram twice. I repeated this whole process twice, and I'm still only at 1GB when I had 4.5GB before all this started. Whole thing doesn't make sense. What would be taking up all that space mysteriously??