I work at a video production company. It really depends on what your rendering and for what kind of distribution. Now 95% of our stuff is for DVD. Sometimes we do trailers for people to place on websites. We use Sorenson 3 in a quicktime (.mov) wrapper.
If you look at QuickTime movie trailers, that is still the codec of choice for online movie trailers.
We like QuicktTime because it's a pretty universal format. Windows and Mac users have no problems and linux can get Quicktime content to play if they know what they are doing.
Again, we are a nearly 100% Apple shop even to the point where we are using Shake more and more over After Effects.
I have never been a great fan of Divx because it requires people to download the Codec fist. Granted you have to download QuickTime player for the .mov, but most computers come with Quicktime, and most users get it with iTunes now in the PC. The number of general users that will go out and download a Codec to watch a trailer, especially for our client's market base, is very small.
Since most of the video's we produce are marketing related for businesses, they use these sales videos to try and get more clients and often times the people looking at these videos are not techies and don't even know what a Codec is let alone have admin access to install it.
If you say, "You need Apple QuickTime Player", most people either already have it or at least know what it is and most system Admins will allow the program to be installed.
Then there was the whole thing about Divx and OSX not always getting along all that well too...
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