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I am in the same position where I planned to purchase it to support to the developer. I am worried that there is no further development.

You can see the development progress here (http://www.sublimetext.com/dev). It still very active development.

I am aware of the dev build. But latest stable version is still in Feb 2012.

The dev version work just fine for me and I use it almost everyday.

development is most definitely ongoing. There is a new dev build almost every week.