Titanium 0.7 has just been released, and some of the features do look rather exciting.
By far, the best new feature is PHP support, which adds a whole new dimension to Titanium development. It will also facilitate the porting of existing codebases and frameworks to Titanium apps, potentially increasing the market substantially.
Another great new feature is the introduction of native social APIs. You will be able to connect to Yahoo YQL, Facebook Connect and Twitter all from directly in a Titanium application.
There are a quite a few smaller changes, and while I have yet to confirm it, I have it on good authority that Titanium 0.7 also now supports native drag and drop functionality.
Things are really looking good and Titanium seems to be maturing nicely.