yaix2 - 6:34 am on Mar 12, 2010 (gmt 0)
neat application called “computer janitor”
Be careful with this one, to not delete too much things.
install ill required dependencies
The package managers usually remove everything not needed, but leaves stuff that might be needed later. But that's at most a few megabytes on the HDD. If you are very low on HDD space, to remove those packages, type "sudo apt-get autoremove" in the command line.