Look at hidden files in your home directory. I've had ~/.xsession errors grow to a large size causing problems. An easy way to spot large files like this if you run konqueror is to use the File Size View. A 2gb file will stand right out. This will also let you find a directory with tons of small files such as ~/.thumbnails, ~/.picasa or /var/cache/beagle.
Last edited by jschiwal; 03-09-2009 at 02:05 PM.