Several months ago, I posted my first ColdFusion extension. It allows me to switch the web root on IIS to any folder in ColdFusion Builder. Since my primary development machine is Windows XP, this has proven pretty handy.
In the intervening months, I have found that I have used this several times a day. In that time, I haven't needed to change the underlying code at all. So, I am going to go ahead and call it a full 1.0 version.
The experience of writing the extension (based on a script by Jason Holden was really easy. The documentation for writing extensions was clear and easy to follow and the actual process was easy as well.
If you are thinking about writing an extension for ColdFusion, I would really encourage you to give it a try. It is probably easier than you think. It was certainly easier than I expected.