Looks smart! Curiously, any reason you chose not to use Revel?
1) I didn't want routes in a text file. This is whiny, I know. Just a personal preference. 2) Go is the only programming language that has held my attention long enough to actually finish a fairly usable framework. Writing a framework is a good exercise in software design, so I felt like I had to use the opportunity.
I ask because I am looking to put my weight behind a framework and am undecided, but not at all attracted to Revel...
I've started writing subpackages as they become important to me. The most useful thus far is probably gadget/forms, which is very much inspired by Django forms. I prefer a data validation layer that is independent from or at least very loosely coupled to a model layer.