For those of you who want to take perfect screenshots of your Android phone (for perhaps making a DIY guide on how to tether your Android Phone), my honest suggestion is to get a really good DSLR camera such as the Canon 7D. That’s the camera I used to take all my HOWTO photos over at my Nexus One Hacks blog.
If you have more uses for a professional-quality camera that can do macro/low-light photography like a champ, definitely plan on getting a DSLR camera.
For anyone else who’s just doing it for plain fun, you can fiddle around with Android’s SDK, which has a tool that will let you capture bit-by-bit image of your Android phone’s screen.
There’s two guides I recommend, try this one first (it’s for HTC Incredible but should work on any Android phone) and also this one here.
But seriously, I find that my DSLR camera takes great photos of the screen plus the phone itself, which I think is important. Well, just sayin’