Yesterday I gave a talk about Taginfo at the FOSSGIS2011 conference. The talk is in German, you can download a video (570 MB MP4). Many thanks to the volunteers who created the awesome videos of all the OSM talks at FOSSGIS!
If you are interested in Taginfo and want to help improve it or use its databases or APIs, come to the Taginfo Developer Workshop on the 7th/8th of May 2011 in Karlsruhe, Germany. UPDATE: Workshop was cancelled due to lack of interest.