Very good article. We use Yammer and their AIR client is a constant source of frustration. Bloated, CPU-eating, inconsistent and annoying. I use Balsamiq Mocku

Very good article. We use Yammer and their AIR client is a constant source of frustration. Bloated, CPU-eating, inconsistent and annoying. I use Balsamiq Mockups when I have to, but I always find the experience annoying. If there was a Mac-native app with similar functionality, I'd switch in an instant.