Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
Conky is a highly customizable desktop monitor for X Window System. Think of it as KDE4 desktop widgets on crack. Conky, a fork of torsmo, has been around for a long time but new Linux users usually stay away from it because customizing it requires editing the scripted configuration file, which can be a bit intimidating for new users. Thankfully there is a whole group of conky users who share their beautifully customized conky setups, which can be installed (in most cases) by simply replacing the original conky config file, located at /etc/conky/conky.conf, with the customized one. Of course, if you want to customize your own conky setup, you might want to check out the official documentation and this excellent tutorial.
Here are 8 of the most beautiful Conky desktop monitor setups with links to download and instructions to install them: