jummp.in letsjump.in jummpp.in
and incidentally, but completely unrelated,
hummpp.me ;)
which would should be the canonical? I am think letsjump.in? then in the future i can maybe buy jump.in, without having to rebrand
Incidentally, I agree with all of the above commentary. Unfortunately, it's the sad reality of trying to start up an online service/product/whatnot today.
For the canonical, I like letsjump.in or gojump.in - and it's never too early to try and snag jump.in (the owner might be willing to part with it for less than you think). Good luck!