Just a quick note to say I'm not abandoning the thread on the AutoIt forums, (http://www.autoitscript.com/forum/index.php?showtopic=91018). I just thought it would be easier to manage the project from here. (availability of older versions / bug tracking etc.)
The current version here actually refers to the development of version 4. The current "current version" (v3.3) can be found either in the "archived versions" zip here or at the link immeadiately above.