Group items tagged

How do we categorize information for later retrieval.  Although this "game" is fun and addictive and really serves the purpose of improving Google's image search engine, it has learning value.  Playing this game can help us think about the difference between the traditional way of "filing" information in "folders" for later retrieval and the new, web 2.0 way, of "tagging" information.  How are tags different than categories?  What is the power of tagging in terms of access to our own information as well as the learning potentail from the collective mind?

From Paul Hami's blog: Here's a quintessential free Web 2.0 application that consists entirely of user-generated content that is shareable, searchable, and often downloadable. As its name suggests, slideshare hosts slideshows; and anyone can create a free account and upload to slideshare. Uploads can include PowerPoint, pdf, or OpenOffice (odp) file formats. Uploaded files on slideshare can be tagged to facilitate topical searching. As well, slideshare facilitates comments, favorites, etc. It also provides forums for specific communities built around shared interests. This summer, slideshare became even more powerful by introducing the concept of "slidecasts". You are now able to upload audio commentary and/or musical accompaniment. The audio file must be hosted elsewhere on the net, but this isn't difficult to do, and there are several sites where audio files may be hosted free of charge. Our Media and MediaMax are two examples.