If you're subscribing to the quicktime diggnation feed through iTunes, that's probably the problem, I don't think the media player on the Blackberry supports MOV files. I normally subscribe to the small AVI RSS feed off the revision3 website and then convert that AVI for optimal use through Roxio. You don't have to convert them using Roxio though since the BB Media Player will play the straight AVI file... I do it though to bring down the resolution and reduce the fps as I've had issues with the BB rebooting cause it can't handle the raw resolution and fps from the straight AVI file. Seems to work quite well.
PS - Welcome to the forums!