Ubuntu :: Log Files Eating Hard Disk Space?

running ubuntu 8.10 amd64 on my HP intel 2.26ghz dual core processor, 320gb hdd and 4gb ram. My main problem is that when I dual booted ubuntu onto my laptop, I had vista already installed, so I only set aside 20GB of hard disk space for ubuntu, which seems like more than enough to me. What's going on is that it says I have used all my space and only have one GB left, when the only thing I have on my computer are word files and necessary installs like flash player, compiz, avant, etc.When trying to hunt down what was using all my space, first I checked out the disk usage analyzer (some pics from here in):theres my hdd with 1/19 gb remaining here's a breakdown of my home folder, showing that it's not using very much at allhere's my filesystem, now we can see that all the space is being used in the folder: /var