I have been playing with OGM a bit and find it very cool, the format retains dvd chapters, multi audio (say jap audio, English audio, and cemetery) and multi subtitle streams (say English subs, French subs)
Anyway check this link for how to make your own.
http://www.nanomessiah.com/dvd-backup/ogm-divx
BUT the thing is a made a OGM of a DVD and now I find that Xbox media center will not fully support OGM for a while. As in it plays OGM fine but can not select subtitle tracks or audio tracks. (I didn't relies this as I had yet to do a non English dvdrip)
Q: Dose anyone know how to rip subtitles OUT of a OGM file?