Todd Warfel, by way of a comment he made on my recent article on B&A, re-introduced me to ProtoNotes. I remember hearing of it a year or so ago and thought it seemed an interesting concept, but then sort of wrote it off because it only worked in IE :(
The one huge drawback that I see with the current version of the concept is that it is a hosted service. In other words, let’s say I’m showing my prototype to a client and, for whatever reason, the ProtoNotes site is down, and without warning my annotations aren’t accessible. Not good. For that reason, it seems me that ProtoNotes should optionally be made available as downloadable and locally installable package, eliminating the dependency on the service.
I also think there could be a non-branded version that would be available for purchase. (I.e. that doesn’t have the ProtoNotes logo on it.)
Overall, though, I think it’s a really great concept.