For me, the planned "Feather Wiki Nest" tool is the most interesting, as an internet-accessible, editable, organised set of notes is a killer-app.

I currently use Noteself (tiddlywiki + local / remote database saving function) for this, and it's an excellent solution that I'd be loathe to migrate away from. The main issue is having to setup and host a CouchDB instance, but once it works it works well. If 'Feather Wiki Nest' has a lower barrier to entry than Noteself, then I could see it being very popular.

Whilst I use Noteself for personal notes and life organisation, I may use Featherwiki as a blog platform, just to keep a thicker separation between the two (I've previously considered using Noteself for blog content to then publish as static HTML).