First and foremost, I have found this one: http://innuen.do (!!!)
Seriously, that must be one of the coolest domain name hacks I’ve ever thought of. And, as of now, it’s available! Someone please go buy that, kthx.
In keeping with this theme, I also see that comman.do is available, although unfortunately crescen.do is not.
Unrelated side note: did you know Antarctica has it’s own domain extension?
Here’s a cool one that might be available for any mystic, superstitious types: http://occu.lt
Finally, if anyone could register http://gra.ph, that would probably be amazing.