I was looking for a screenshot tool some time ago and did not find one.
Therefore I have created my own one. (not to blame the other cool script found in that thread)
It's a small GUI that let's you take a screenshot and safe it in 3 different formats, autonumber filenames, resize, add frames, review the screenshots and copy them to the clipboard.
You can find a screenshot attached
If you like it please contact me and you will get the download link.
You might as well check this thread: Screenshots of the BlackBerry Display