Try out a free little program called Any Video Converter. Just google the name. You can take the .vob files you got from DVD shrink and combine them with anything from wmv, avi, flv and I dunno what else. It will convert it to just about anything you want and shrink the size down as well. Mrs H got a new Nokia 5800 and we used this handy program to recode a number of videos to go on the new mobile. Works a treat. Don't even worry about getting the Pro version as you don't need it, free version works great.
Also, if you want to be able to fit x number of movies on a disc just play with the options until the files are small enough. you'll lose quality but there is always a pay-off somewhere.