Yep, I have been using it for almost 2 years now.

I work in an IT department and often have a use to make screenshots when building tutorial websites for our users.

I had downloaded two programs - MWSnap and another - I believe it was called FS Capture.  I tried MWSnap first and it did everything I needed at the time so I never got to FS Capture (if indeed I'm remembering the name correctly).

I'm not certain what a previous respondant means by scrolling windows, but I do ocassionally have a need to capture the Windows start menu and MWSnap is not able to do so.  I have not found such a program that does, although frankly I haven't gone looking very hard.  I seldom make static tutorials these days since I discovered Wink.

Wink from debugmode.com is a video capture program, but unlike a lot of the really expensive "video format" capture programs, instead captures series of screenshots. Now, if I need to get a screenshot of something moving, like that damned windows start menu, I fire up Wink. It's not perfect, but the few idiosyncratic features are easy to deal with and the program is so easy to use....

I really like the "stream of screen captures" approach and find it easier to manipulate than a normal video stream.

Disclaimer: I am not affiliated with Wink, I only think think it's the best damned free video tutorial making software ever invented.