Many them are great. The one challenge is that if KPR educators all decide on different tools (for example there are 5 recommended tools to create wikis) then it becomes more difficult to provide PD and support for each other.
Some years ago I had the chance to get a tour at River Oaks Public School in Oakville - which had one of the top reputations in Canada and the world - (many international educators toured it) in the successful use of technology in the classroom. See Wikipedia article on it:
I interviewed the Jerry Smith, the principal and asked him what is important for the successful implemenation of technology in schools. He said one of the most important things to do is standardize the use of the technolgy so both students and teachers can teach each other how to use it. He also said it very important to choose technolgy that will last into the future. From the list of web 2.0 tools in the above link how many will still be around in five years ?