I've tryed all other codec pack and this is the best for sure. It haves all the decoders needed plus some good encoders. It's easy to register the DivX v5'2'1 codec included to unlock the encoder functionality. Even without this option you have full Xdiv and MPG Fast and Low Motion encoding.
The full pack may be a little complex and have unneeded features for the common user, so don't waste your time and download the light pack right now.
DJBCP Codec Pack 4.4.0 on 13 February 2005, reviewed by: phiphi