i think you would get a lot more feedback if people didn't have to run around online to get the proper player to be able to see your demo reel. if you have it compressed with divx but in avi format i'm pretty sure that would be more readily downloaded and watched by a larger audience than with the actual divx format.

when i installed divx, i got rid of the player and kept the codec for watching avi files and compression capabilities in after effects. i believe the most easily viewed file formats to be .avi, .mpg, and .mov. as long as you let them know what codec you compressed it with they'll know if they can watch it.