HoverSnap is a a free handy snapshot tool with jpg, png, bmp and gif support.HoverSnap can take snapshots of the full screen, active window or a selected area. It can even capture layered windows (alphablended ones under 2K / XP). You can even FTP upload your screenshots !
You can set up the capture folder / filename and format.
You can reduce the capture size.
Auto-generate filename option will add the time stamp (date/time) to your filename in order to be able to take several captures without having to change the filename.
Optional sound when capture is done.