If you do connect it to a pocket projector you're going to need an app that works with the external display like Expedition - VGA out browser. It can display a browser, docs, ppt, pdf and more.
PK 101 - from Optoma - stumbled across it at my local Apple Store - and wow - when it is pitch black (I mean it - must be dark) - it looks fantastic! - works great with Netflix, AirVideo, TwitPad, Videos.app as well as Keynote (if you are presenting in a VERY dark room) - but it is a great little projector that turns a dorm room wall into a huge monitor.
A wonderful device if you know what to expect out of it - but it comes with an iPad cable that hooks up easily to it - ability to play audio out of Bluetooth or wired speakers while using projector - check out my podcast - iPad Possibilities Podcast - I discuss it on many of my episodes as well as some other cool possibilities the iPad has brought us.
I used an AAXA P2 with their iPhone adapter cable and it works just fine with an iPad. It's much brighter than the first-gen pocket projectors like the Optoma PK10X series and the remote control is particularly useful for doing small group presentations.