UI Blueprints, an easy to use tool for creating mockups and wireframes. I'm happy with the initial feature set and am looking forward to making lots of improvements to the software. The initial goal for the tool was to offer a solid set of UI widgets along with all the standard features you'd expect in a useful mockup tool including grouping/ungrouping, resizing, undo/redo and several different options for customizing various widgets. In addition there are several controls for building wireframes of mobile apps; this is an area I'd really like to build on to help designers make rich mockups before one line of code is ever written.
There is still a lot of work to do, but it feels good to get the One Point Oh release out the door! Check it out at UI Blueprints - easy to use mockup software!