Are you using yum? Then run a "yum clean all" and I bet you will get a lot of space released.
Alexander
That chopped it down from 1000MB to 150MB. Thanks, Alexander!
Without looking into it too deeply, I would guess your /var/cache is previously viewed webpages. And it's the only thing that is really causing you grief in /var... The rest consumes a trival amount.
So just do a "rm -rf /var/cache" to wipe it out.
You can make this command an alias and/or add it to your startup script or even a regularly occuring cron action if you like.
That chopped it down further to 109 MB. Thanks, Jephthah!
Now I'm wondering what that 109MB is about and whether I need any of it...