I'm sure most of you keen jumpers have figured it out already, but I have been having a lot of fun with it at the Grandma Arena. You put your bomb on the jump pad (on Grandma Arena the pads bounce very very high btw) and by detonating it soon after jumping on it you can go much much further or higher depending on when you detonated it. It's a lot of fun to do. I use it on LazeRaze when someone is camping the bridge to the left of the spawn. I just rain bullets down from way up high and they don't know much about it. I've also noticed that there is something like a skill wall. On Grandma Arena you jump too high and activate your jet pack, it runs out a lot faster (under a second on level 3). Probably to counter exploit camping which is fine. Hope I see more people catapulting across the map.
One of the dev's commented on this somewhere. Something about invisible barriers being hard to make behave correctly, so the increased skill drain at a certain height was actually an easier method to prevent people from getting where they are meant to.