Hey Ben - nice work! You don't mention it in your writeup, so perhaps you haven't seen it before, but I highly recommend checking out my website, http://www.cocoacontrols.com. It might prove useful for your next project.
Thanks for making Cocoa Controls. It is indispensable.
thanks for making this, have looked through the site many times. wish there was more [modern ones] for OS X, but I understand that's a reflection of what's out there. :)