how to free up memory for root

[Sean Hammond]

My root partition is running short on memory. I'm using Ubuntu's
default partitioning scheme except that I mounted home on a seperate
partition. So I think I have root, swap and home partitions. Root is
running a little low on free space, and I don't really want to learn
what happens when it runs out. Aside from removing apps I don't use,
what can I do to free up root space on Ubuntu? There must be a
synaptic package cache and other caches etc, files leftover by removed
packages, temp files and so on. I'm using Hoary.

Thanks,
Sean