The last hurrah of Webmonkey is a good one. The cheekily named “The End-All Guide to Small-Screen Web-Dev” covers the history and the technology behind small-screen devices, while still managing to offer pages of design and development tips.

Since I’ve mentioned that piece, I might as well plug two other valuable resources:

1. The stunningly comprehensive table of browser support for various character entities has been compiled by css-discuss member “Nancy” — worth a bookmark.
2. Apple’s helpful table of what CSS properties the various version of Safari support.