Mike Doughty from PCB Smoke shared his DIY 110v temperature controlled soldering station in the project log forum:

This project is build number 2 of a 110v temperature controlled soldering station. It is a follow-up post to the project that I was working on last October.
Blog post with complete details here.
This version has a couple of improvements over the first build. This new soldering iron is a better unit and was less expensive than the first one.
A chisel tip plus a selection of other tips was available for this soldering iron instead of being limited to a conical tip only.

More details at PCB Smoke project page.

Via the forum.

Check out the video after the break.