The GTD app scene has been pretty quiet for a while now. Only OmniFocus seems to be regularly showing signs of development at a pace that offers some real hope for the new generation of task managers. But Things has updated to version 0.9, and offers a couple of new features that fill some major holes. Most notably, the addition of recurring tasks is an answer to a primary criticism of the software.
A lot of people love the simplicity of the Things philosophy. I count myself among those people from a conceptual standpoint, but the "simplicity" approach only goes so far when I find myself in need of some heavy-duty organization. I still find the lack of integration with applications like Mail and the lack of scriptability to be major impediments to incorporating Things into my workflow. In my time testing Things, I was able to create some AppleScripts for adding Mail messages and importing from OmniFocus using some brute-force "System Events" tactics. It's certainly not ideal, though.
I'm hoping the development pace of Things picks back up as it has the potential to be an ideal system, at least for users like myself. In the meantime, you can download the trial and/or get in on the pre-release discount of 20% off the $49 price. For more information on the 0.9 release, check out the release notes.