I won’t, at this time, go into why Tagroo powered by OpenCalais really represents a hint of “Web 3.0″ (although I almost shudder using that term!), you can read more about it here. However, I will say Tagroo is a fantastic tool for Wordpress blogs (and also incidentally say why Wordpress is still the best blogging platform)

Basically Tagroo suggests images (from Flickr) and tags using the meta data (facts, places, people) that Tagroo using OpenCalsis automatically generates. Saves time and improves your own metadata. You can go to to the OpenCalasis website for more information. Essentially it extracts semantic data from non semantic documents and then saves that data into a vast database that can be queried by an OpenAPI. There is great potential here for educational materials I think as well as making the internet in general easier to use as well as safer to use as ultimatly the connections made with OpenCalais and other tools like Google Social Graph will make data on the web easier to legitimize.

Sometimes the suggestions are a bit random (such as with this post for instance) but I have no doubt that will improve with time and it depends quite a bit on what you are writing about.

Test (editing post using Adobe Contribute)