Zen Jar looks like an interesting experiment in social networking. You write something, send it off into the iPhone inter-ether, and see what karma -- good or bad -- other users ascribe to it. Personally, I prefer the direct bludgeoning I take for ill-conceived comments on Twitter, but for those tiring of the same-old micro-blogging, status-updating experience, Zen Jar is certainly an alternative. It comes in Lite (Free - iTunes link) and Paid ($0.99 - iTunes link), and you can check out Bela's review in our iPhone Apps & Games forum for more.
If you give it a whirl, let us know how your karma turns out -- mellow harshened, or child-like sense of wonder restored?