SOMPY.com has released the SOMPY MovieEncoder to convert video to a format and file size that will work with your mobile device, including Pocket PC, Palm, Smartphone, Portable Media Center devices. It works with the wmv, rm, rmvb, avi, mpeg, mpg and Tivo2Go file formats as well as DVDs (*.vob).
SOMPY also offers the Sompy Media Player to let you watch your movies on your Pocket PC.
Both programs are available as freeware.