I wonder why is there no blackberry interest?

Anyone has expreince writing for BB?

Bad marketting, honestly, though that applies mostly the kinds of circles HN types hang around in.

The BB SDK is far more powerful than the iPhone SDK, since you can do much more with it - background and startup apps, extensions to existing apps (like having your app's functionality show up in the email client's menu), listening to systems events etc. And it uses Java, so you only have to learn an extra API rather than a whole new language. Their IDE is kinda crappy, but you can use Eclipse or whatever you prefer, so it's ok.