Phil Libin's long term plan for Evernote[1] is precisely what this sort of application requires, and is at total odds with Google's product release/discontinue approach.

Google Notebook was "discontinued" only a few years ago - and the kinds of consumers who would be interested Keep almost certainly share a significant overlap with those who two years ago were interested/used Notebook, and therefore have literally been bitten by Google in this exact space in the last few years.

[1] http://vator.tv/news/2013-01-17-phil-libin-on-an-evernote-ip...