The large, incredibly readable font on the Pre is part of why we said the OS was so usable in our review; we didn't know Palm commissioned the fonts themselves.
The company responsible for the font—Font Bureau—makes custom designs for "publications and corporations". This particular one is called Prelude, and has a similar sibling that Palm uses for the ads.
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And if you're really a font fan, you'll want to check out that font fight video we posted a while back. [Typophile via Engadget]