This is great news for the Appcelerator guys, but I've gotten so used to writing Titanium apps in TextMate, that I'm not sure I'd really need a dedicated IDE!
Just to make the point clear they said in the conference call today that they have no intention of forcing anyone to use an IDE and people using TextMate can go on doing so without interruption.
This should be awesome. I really enjoy Appcelerator's Titanium dev kit and I think it will really come to life with its own IDE/editor. Congrats to both companies it's a great buy.
Still happy for the company though.