As C_D said, making a miniDVD is the same as making a std DVD, just you will burn to a CDR (using a normal CDR Burner) instead of a DVD.
If you follow my DVD or AVI to DVDR Tutes, in the Bitrate tab of DVD2SVCD, just put in 800 as CD size instead of the 4400 as the tute says. If you can burn to 99min CDR's you can fit a bit more on (and set size to 980) . Expect about 13min per 80min CDR and about 16min per 99min CDR as a good bitrate. Of course the lower the bitrate you go the longer the movie/trailer that can fit, but poored quality.
I made one up quite a while back using a trailer off the Monsters Inc and the Ice Age DVD's. Looks great, the kids love it.