Adobe AIR (Write Once, Suck Anywhere)
If you’re deploying a consumer-facing app with Adobe AIR, you’re making a mistake.
AIR makes it look like either (A) you don’t have the taste to distinguish good UX from bad, or (B) you can tell how bad/mushy/laggy AIR feels, but you don’t care enough about your users to give them something better.
I’m looking at you, HipChat.