Thanks to Marcelo for pointing out the recently established fontblog. There are already a number of informative posts that are worth checking out. Although the four minute TrueType hinting video is old, the technology is still interesting. If you'd like to know how ClearType achieves its magic, I'd recommend the ClearType Information page on our Microsoft Typography site. Be sure to run the web-based ClearType Tuner or the Windows XP PowerToy version.
And while I'm talking about fonts, it's worth mentioning the Poynter Online article, The Next Big Thing in Online Type, about the upcoming fonts that will ship with Windows Vista.