I recommend the documentary "Helvetica" for all you font-nerds out there who want to watch a gang of well-respected graphic designers discuss the ubiquity, merits, and downsides (gasp!) of Helvetica. (It was one of J-Fav's surprise V-Day picks for us on Netflix, a choice made even more profound by Matthias's mentioning the film this evening.)
Also, the film has a wonderful soundtrack.
Learn about the film here.
Extra nerd points: you get to hear from Massimo Vignelli (the NYC subway maps / typography, American Airlines), Neville Brody, and even someone from The Designers Republic!
Clearly the late hour is hampering my ability to make a coherent recommendation. Just go see the thing.