I just use My Mobiler for screen shots. Sure, it only works when you are plugged in via USB to your PC, but it is easy and works great. And since I have two computers in my office, two computers at home and a laptop that I carry with me, I pretty much have access everywhere
Also, it does allow you to capture video from the device, which can be handy when trying to explain how to do something on a PPC. Or show off.. like how Teeter works...
http://www.mtux.com/
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