Submitting-to: http://culturedcode.com/contact/
I'm a huge, huge fan of Things. Been a user for quite a while, was one of your early beta testers, and I evangelize it constantly. For whatever it's worth towards seeing some of these things fixed, or development time put to implementing them, I'd also like to point out that I've referred at least a dozen people to buying at least one of the Things suite of apps.
So. Here we go!