I would like my customers to see my feeds real-time. The feeds should be generated /accessible via Folder or Category or Tag e.g. energy.webnotes.net/folder/smartmeters/feed or energy.webnotes.net/category/CIO/feed or energy.webnotes.net/tag/UK/feed. Ideally if there was someone to manage subscribers (like user authentication access to the feed), it would open up new business models.

Agree. Have the ability to easily clip into multiple folders, for different client groups, with different notes/tags. Also related to my comment on this topic:
http://feedback.webnotes.net/pages/17476-general/suggestions/193795-tagging?ref=title

The folders "concept" and only being able to put an annotation in 1 folder is limiting your product/service.

I get a more powerful experience with a concept like Amplify.com which uses Clogs / Categories / Tags. I can post a clip (annotation) to multiple clogs (folders), with different categories / tags. You need similar functionality, to make it easier to generate multiple reports.