Everyone knows Divx, or they should. No, it isn't the alcoholic Circuit City Divx player anymore. It is a popular codec and the company behind it is giving away their 'Pro' version for a limited time.
Advantages over the normal version:
Drag-and-drop nearly any video format to create a high-quality, highly compressed DivX video.
Merge and convert multiple videos into a single DivX file with an automatically generated menu.
DivX Pro Codec
Higher performance, including multi-threaded support for better performance on all HyperThreaded, dual core and dual CPU (SMP) systems.
More encoding options, including six carefully optimized encoding modes that balance visual quality and performance for virtually any application.