.VOB files are way too big of files so it's not really practical. I suggest converting your videos then transfer them over.
DVD Catalyst is probably the best software you can get. It's only $9.95 compared to other software that are way over priced IMO.
If you do decide to get it, use the "Xoom" profile. DVD Catalyst is also a supporting vendor in many of our forums and is around to give help.
I think with RockPlayer it might be possible to play vob files on the tab (or other Android tablets) since they are basically MPEG2 video files, but they are quite large, and because of the official DVD specifications, your movie will be split into multiple 1GB portions. If you convert your DVDs to MP4 format, you can reduce the filesize at least by 4 without noticeable quality-loss, and your movie ends up in one file.