From Tinysoar software:
Tinysoar iphone video converter converts all video formats to iphone mp4. MPEG-4, H264/AVC video codec and MP3, AAC audio codec are supported. Your iphone now can play all your dvd colloections without the need to buy again from Apple iTunes. IPhone, iPhone 3G are supported. 16:9 or 4:3 movie with 480x320 native screen size or 640x480, 320x240 are all supported.