Stackexchange, and now Trello, are much more open than Fogbugz. Fogbugz was innovative at it's conception, but now it seems legacy (for the record, I use Fogbugz every day, love it, and probably continue to use it). He faced Atlasian, he took VC money, and aims for an open grand market target. That's quiet a change.

Nice quote: "when VC give you money their only bet is that you will ride the tornado".