I'm still fairly new to it, but I use DVD Fab 1.52 for splitting to two discs. Either DVD Shrink or CloneDVD sneak preview for transcoding/shrinking the movie to fit on one DVD-R.
Both of them have their merits.
Oh, and DVD decryptor for just plain decrypting to hdd work or copying a single sided/layered disc 1:1.
A question for all you DVD freaks out there...
Whats the best program/way to remove stuff (eg extra audio tracks, unwanted extras etc) from the original DVD to help better fit the dvd onto one disc?