Just a note for any one toting around an Apple laptop, be it an old iBook or a new MacBook: Get a video adapter!
More than a few times in the last year I’ve seen someone show up with an Apple laptop, and then look at the VGA connector on a projector, and have an “oh shit” moment where they realize things won’t plug into other things.
Even before my (pre-owned) iBook arrived, I had tracked down the needed VGA and s-video/composite video adapters on ebay. (I got both for under $20.)
I tend to carry my adapters around with me, and even offered one up at BarCampMadison to someone. Of course Apple in it’s infinite wisdom likes to change things each year, so my adapter didn’t work. (I ended up just letting the presenter use my iBook, though I warned him if it wasn’t interesting, I’d take my iBook and leave.)
For the modern folks, it looks like the Mini-DVI to VGA Adapter is pretty cheap, around $20. That should work for the MacBook and 12-inch PowerBook G4. If you have some other model, track down what adapter is used and order it today so you’re ready for the next user group meeting or BarCamp presentation.