Just as an update, the staff here are figuring out the best way to arrange the 3.5 beta hack subforums. We are also planning a way to make searching for hacks easier through a database-like interface.
There will also be tutorials on how to use the hooks and plugin system as well as which vB variables have been changed from 3.0 to 3.5.

All thanks to the hard-working vB.org staff.
It's going to be good.