I'm a fan of hacks - I was stoked to get Vouche.rs for my collection. I've had a few low-mid $xxxx offers over the past 12 months. Out of stubborness I continue to pay $99 a year reg on it for no real logical reason.
Personally I think hacks are good for url shorteners if you have the .com or .au even. Most would agree it's not the best idea for a brand as people will get confused remembering where the dot goes.
That said, if you develop it and the idea gets traction (in the market of tech startups) then I would assume your target audience should be more than capable and willing to remember it.
Also worth noting that purists wouldn't consider a 2 word hack a real hack, unless the second word was the extension, i.e. About.me - there's a thread on NamePros that's been going on forever and a day you may find interesting.