Besides Princess Diaries, what are all of Meg Cabot's books that were made into a movie? When did they come out?

Well Avalon High has been made into a Disney Channel Movie,its quite different from the novel, though. That's the only one i know of, it came out last November.

From Wikipedia (link):

In 2001, the film version of the Princess Diaries was released. The film starred Anne Hathaway as Amelia "Mia" Thermopolis and Julie Andrews as Clarisse Renaldi.

The Disney Channel original movie version of Avalon High premiered late fall 2010. the film starred Gregg Sulkin as A. William Wagner and Britt Robertson as Allie Pennington (Ellie Harrison)

An Untitled Queen Of Babble movie is currently In Development. The book has been optioned by Jeffrey Sharp of Sharp Independent, with Kristen Bell slated to star.