Please download the source and inundate me with comments, bugs, and feature requests. There's an issue tracker tab on the CodePlex site that we can use to track bugs, as well as a discussions tab for, well, um, discussions.
Note that while I'm the only developer on the project, anyone can write an add-in now. I tried to make the add-in model as simple as possible. See the wiki page for a header file, a sample add-in, and docs. Lemme know what kinds of add-ins you dream up.
I want to thank everyone for being patient while I worked out the details of getting this source published. I hope you find the source instructive.