The name may not be sexy but I just found this really cool system monitor app called Conky. To install on Ubuntu:

sudo apt-get install conky

It may not be obvious from the screenshot here, but it’s translucent so there’s not bulky apps getting in the way when you’re trying to GTD:

Several excellent resources for people crazy over Ubuntu:

UbuntuHQ

ArsGeek (Ubuntu Category)

The Perfect Setup - Ubuntu 6.10 Server (Edgy Eft) - a tutorial from howtoforge.com

Install Subversion 1.4 in Dapper with SSL and Berkeley DB Support

Ubuntu Forums