free utility to verify downloads with an md5 checksum from the makers of midwavi pro (it's only 100k and this is a true windows program!). can also create md5 checksums.

imtoo mpeg encoder is powerful mpeg converter software which can convert avi, convert mpeg, convert wmv to mpeg. the mpeg encoder not only supports convert among all popular video files such as avi, mpeg, divx, wmv, mp4, mov, flv, 3gp, psp mpeg-4, ipod mpeg-4, etc., but also provides easy ways to extract audio from video files, convert among all audio formats like mp3, wma, wav, aac, m4a, etc.