I was going to link to that, thanks Ralf.
Fontin(Sans) is just wonderful, kerned with care and full of Opentype goodness. Most of the fonts by Jos Buivenga are equally carefully crafted. As a pixel font, unibody is unique, and the foundary that makes it, Underware, also make my favorite book font, Dolly:http://www.underware...index.php3?id1=fonts
As a typographical aside, I was recently shocked that Vista's fonts (which are realy nice), are still so neanderthal - how can anyone that cares about typography continue to ignore opentype. But then, Windows typographical technology is still stuck in the dark ages...
As a launcher aside linked to that list, Enso uses Gentium for its UI typeface, and elegantly lovely it looks too. Gentium is just great, a flexible multilingual humanist renaissance font. Day serif on that list is also great, keeping the imperfections from the original 15th century version in tact unlike more modern digital Garamonds.