If you looking for a free screen capture utility, that is hassle free, easy to use, and allows annotations, then you can give
Easy Capture a try.
My 30 free-trial version of Snagit just expired, and not wanting to cough up the $50 bucks to buy the program I did what any cheap bastard would do and did a little searching.
I found several good screen capture utilities by reading the reviews at this
site, which included
ScreenShot Captor. You do need to register and get a product key for ScreenShot Captor, which I'm sure is not a problem. I also believe it's more feature rich than Easy Capture.
Steve