a bizzare imac issue

at some point, my hard drive became completely full. i thought it was too many podcasts filling the place up. i deleted them. nope. so i looked it up online. sounded like a virus or a "log file overrun". no viruses currently messing with mac osx. i assumed it was a log file overrun, where some file was just growing infinitely larger. i stopped using the imac, because aaron's was sitting right next to it, and i would take mine to the shop sooner or later. when i turned it back on today, it was all okay, nothing wrong. yet. we'll see how this pans out.