i have once read on a technique to record more than 700MB on a CD-R, but i can't seem to find it, does anybody knows?
its called over-burn, your software (such as nero) and burner must support it. You can only cram a few more megs onto it though. they do make 90 min/800mb CDRs though, you can find them at allmediaoutlet.com
there is another option in nero that will allow you to add about 12 extra megs to a cd-r, just look in the preferences in nero and check enable generation of short lead out.