After residing in unix-land for almost a year I decided to come back to Mac OSX just 2 days ago, and after re-downloading my purchased apps, the announcement by the Sparrow team was the second mail I picked up. Fuck.
Thinking back, in unix-land no such jokes were pulled. Something abandoned? another trooper taking over. How the $#&% can you charge money for something _non-open-source_ and then just leave it to rot?
I would pay a hundred bucks for a similar app (or a monthly fee) if I'd be assured that the developers were dedicated to ME and THEIR PRODUCT.
Sparrow is above average. Congrats, I loved you for that. But you sinked your goddamn ship before it got half way. I'm only this pissed off because it could have been so much more. I will wait and see what glorious work you do for Google. I (and all the people who paid you money) await your work with great anticipation. Good luck.