I just watched Stranger than fiction on DVD. Great movie. It does a lot with its fantastic premise without losing sight of character development. Will Farell is convincing enough in a "serious" role and Emma Tompson and Dustin Hoffman tone it down; so they don't distract from the movie too much.
Tip: I'm usually not too much of a sucker for extras, but this DVD's "deleted scenes" contain good improv material and scenes that actually give the movie more depth.