I was just perusing one of my long-time favorite blogs and found a reference to a utility for capturing windows called Window Clippings by Kenny Kerr.  What a slick little tool!  It's funny how the stars have aligned (but just a tad late on this one).  I was doing exactly this earlier today - capturing windows regions for a help document, and I had to go into each one and 'clean-up' the upper right and left corners because the XP-themed windows used a non-rectangular region.

One fantastic aspect of this utility is that though it ultimately captures a rectangular block, it identifies the window region and marks the rest of the image as transparent (for PNG images).  I've written many applications that use irregular regions and this utility will save me a lot of clean-up efforts on my screen captures.  Kudos!

[Update: My apologies to Scott Hanselman for the repetitive trackbacks...I've had to repost this a few times.]