There are no shortage of variations on these workouts.
Can you do dips with your feet pointed up, almost level with your eyes? If you can, then I'd say you've done all you can (and should probably join the Olympic gymnastics team).
Try Hindu pushups which are really good for flexibility, posture, and strength and endurance. Also, if you can do handstand pushups, you're going to get a much better workout than you would with weights. No offense, but I doubt you can, so there is plenty of room for development there.
You can buy a weight vest from Target for pretty cheap. Put one of those on and instead of lifting your bodyweight in a pullup/chinup you're lifting your bodyweight plus 30-50 lbs.
I think the best way to transition from bodyweight to weights is to use kettlebells. Again, available at Target for not too expensive.
I'm not sure what your goals are. Mine are to look like Marc Jacobs with my shirt off, and not bulking.
But if you want to bulk be sure to make sure you've got total control over your body thru bodyweight exercises before moving on to weights (to prevent injury, be flexible, be stronger, etc.)
And remember to EAT!