TaggaTidning.se is a web site where anyone can tag news feeds from Swedish media. That way, news articles about the same subject will be easier to find.
No signup is required, although I may add that later. I also plan to add geotagging and there will most likely be a mobile application sooner or later.
The business model is advertising, plain and simple. Adding the tags gives some added context for advertisers which may be leveraged.
The site was built by me alone, using JBoss SEAM, a java framework similar to Ruby on Rails.