If you need good looking fonts to use on your desktop, website or even commercially check out the fantastic set of freely downloadable fonts at Font Squirrel. Many of the fonts are available in Google Fonts too.
If you are into programming, check out the fonts from Source Code Pro.
To get the best font faces on Ubuntu, try Infinality patches. To install on Ubuntu:
$ sudo add-apt-repository ppa:no1wantdthisname/ppa $ sudo apt-get update $ sudo apt-get install fontconfig-infinality freetype
Webpage: Font Squirrel