I love good fonts. It’s one of the things that I enjoy most about Mac OS X — the font rendering is wonderful.
Lately for programming and Terminal use, I’ve used Inconsolata by Raph Levien. It’s a very clean monospaced font that renders really well at 12 points and higher, and is perfectly usable for coding at that size. It avoids the Vera Sans Mono problems with too-thin horizontal lines at common sizes.
Tonight — thanks to Jens Alfke and his logo design for the Mercurial distributed SCM system — I’ve discovered the free fonts from Yanone, specifically Kaffeesatz and Tagesschrift. Kaffeesatz in particular is a pretty slick font; hopefully I can find a use for it in something.
Any other free & open font suggestions? Let me know in the comments. I can always use more great fonts.