Several day ago, I saw a dvd ripper on www.stumbleupon.com, then I had a free trial and found the image and sound quality are both quite good. It can easily rip DVD to almost popular video formats, such as MP4, H.264, AVI, WMV, FLV, MKV, MPEG-1, MPEG-2, 3GP, 3GPP, VOB, DivX, MOV, RM, RMVB, DPG...