With this service you can create your own databases: bookmark managers, to do lists, etc…as Brian puts it:
“The idea is that you create your own applications storing information the way you want and viewing it the way you want.”
Plenty of exporting choices…RSS and OPML on board, and also sharing your database/s for viewing or even collaboration.
This is not the same as Ning, but it is along the same lines, in enabling users to make applications to share with others…lately the web2.0 environment is really turning users into drivers.
A similar service is baseportal.