Program to rotate AVI files?

adrian_at_cam.cornell.edu
Date: 12/29/04 

Date: 28 Dec 2004 18:09:03 -0800

I have a bunch of 30 second AVI files generated by my Canon S30 camera:

mvi_1329.avi: RIFF (little-endian) data, AVI, 320 x 240, ~15 fps,
video: Motion JPEG, audio: uncompressed PCM (mono, 11024 Hz)

Many of these files were taken with the camera rotated 90 degrees, and
it can be a bit jarring to watch them sideways on the screen. Can
anybody suggest a program that can rotate these movies 90 degrees into
the correct orientation?