A few new sites to share...
Classtools.net has several tools that you can use on the SMART Board for learning and classroom management. You can create your own interactives using the premade templates. One tool I really like is the random name selector (that way I don't get moans and groans for picking on students).
Taggalaxy is a REALLY sweet site that makes a galaxy out of tagged pictures that you search (from Flickr). It is a fun way to explore places, concepts and ideas because it graphically organizes the pictures by tag words. Check it out!