It does almost everything it promises and greatly so.
What I would really appreciate is to have separate layouts for different screen setups (that is still not there – guys, I wont reset it every time i hook my MBA to my external display) and the chance to cycle through the layouts per hotkey (in particular between narrow and normal). Customising the dimming and having a shortcut for hiding the app altogether would make it a killer app. Nonetheless, quite awesome.
Mattematte about Blotter, v2.1