This has the potential to be REALLY effing neat.
PhoneSuit, whose main business is iPhone protectors and chargers, recently unveiled the MiLi Pro, an iPhone video projector that's literally not much bigger than the phone itself. You can directly dock your iPhone (3GS, 3G, or 2G) or iPod (Touch and Classic), or use the VGA and RCA inputs to hook up computers, DVD players, etc.
The Mili Pro outputs 10 lumens (which isn't super-bright) of 640×480 video on up to a 70-inch surface (although they caution 40 inches is the optimal maximum), and promises a 3 hour battery life.
Pricing is TBD, availability is promised in September. Get those Documents To Go PowerPoint presentations ready!
[More info at PhoneSuit]