I use iPod Video Converter it converts all popular video formats to iPod video. You can enjoy DVD/VCD and AVI, MPEG, WMV, RM, RMVB, DivX, ASF, VOB video files in your iPod.
or I use CinemaForge it convert Ipod (MP4), Flash (SWF), Flash (FLV), Motion Pictures Group (MPEG), Audio Video...