I’ve just written an article on the WordPress Codex (wiki) about how to create options pages and have WordPress handle all the saving / updating / magic for you. I discovered the technique the other day and I think it’s a gem, makes for very elegant plugins!
Great post on the Codex. It’s the simplest explanation of how to update options that I’ve found so far. The sample code was a tremendous help. Thanks for taking the time to write it.
@Laran Evans: New option whitelisting code in 2.7 makes this approach semi-obsolete. It still works, but only as a temporary backwards compatible fix. I’d suggest using the new whitelist options code instead (which is also WPMU compatible). I’ll try to update the article at some point…