Is there a ONE-CLICK conversion tool out there?

...I mean something that could be used for transcoding MJPEG avi files downloaded from a digicam into something compressed (divx, xvid, 264, whatever). Something that could be used by grannies, girlfriends and the like?
Of course, some settings have to be done at first, but I’d like to keep that to a once-only task. Saved once, then used over and over while doing the one-click ritual.
Hmmm?