Bleach bit is a utility which can free disk space, removes hidden junk, and easily guards your privacy. It can erase cache, delete cookies, clear Internet history, remove unused localizations, shred logs, and delete temporary files.
It supports around 70 applications and can be installed on windows and linux. On ubuntu bleachbit is available on the repository. However, it is a nice idea to look at the bleachbit website for any new versions.
On ubuntu you can install it with
$ apt-get install bleachbit
On my system running ubuntu 9.04 , two menu entries were added under Applications->system tools- Bleachbit and Applications->system tools- Bleachbit (root). If you launch it for the first time you will get the following screen.
This allows you to select the desired language also.