Dear members of classroom 2.0 I wish you all happy hollidays and because the year 2011 is near the door let's discuss here and write your favorite here http://www.wallwisher.com/wall/bestedtools2010
and join free this group . http://www.classroom20.com/group/teachingintheclouds
Happy holidays to you too Lucian.
There are already sources of favourites on the web - for example, Jane Hart's Top 100 Tools for Learning. I posted a link here together with some of my own personal favourites. Note her list for the classroom.
Diigo has groups where people share links to web 2.0 tools also, see the Classroom 2.0 group for example. In fact I find that belonging to a few of these means there is quite a lot of duplication as people post the same link to several groups.
See also the links here which I provided for staff at my school. (The Diigo list includes sites with much information).