MWSnap screenshots

MWSnap is a great and free program to take desktop snapshots
Capture menu
MWSnap 3.0 : Capture menu

Alternative downloads

Ashampoo Snap
Capture whatever happens on your screen as a still image or a video.
Automatically Take Webcam Pictures Software
Automatically capture and save webcam snapshots as BMP's and JPG's.
DVD Snapshot
It lets you take snapshots directly from your DVD movie.