For those of you looking for a cheap digital camera, whether for digiscoping or just for fun, the model I use has recently dropped in price. The Canon A590IS is now selling on Amazon.com for just $111. That's pretty darn cheap. I thought I was getting a deal when I got mine in March for $150.
If anyone is going to purchase a camera for digiscoping, I highly recommend bringing your scope to a camera shop so you can see if the camera "fits" your scope well or not.
One of my resolutions for 2009 will be to better learn how to successfully digiscope. Lately I've been having some exposure and/or white balance problems while digiscoping bright white birds such as Snowy Owls and adult gulls. I think it's more of a problem with my usage than with the camera itself, but the Auto mode just doesn't get the job done sometimes.