WatchKnow is a non profit site that aims to pull together a variety of educational videos from the web that are designed to be instructional learning experiences for children. You can filter them by age group or by subject. Worth a look.

Google Swirl is finding its niche on the web of late as a creative image search tool. When you enter your search term, Google Swirl will attempt to group together images of the same type. For instance, search for 'car' and it will group cars by color, or make together.

Public Earth takes Google Maps and adds some extended features. You can search a map for everything from arcades to vacation sites, and everything else in between. There is a huge variety of topics you can select from so I could see this being useful in Social Studies when analyzing different regions for resources.

Mashable has 35 Tools for Teachers, Tutors and Students. Some on this list may be familiar to you, but others are new to me. Grading tools, teaching tools, and social networks are all on here.

DE Tools has a link to a UK site called SafeSearch which is basically a modified Google search engine that is safe for kids to use. Searches are filtered and there are also no distracting ads. What more could you ask for?

Finally, I have seen this a few times now, but have never got round to posting it. Richard Byrne has linked to a TED talk on How to Make a Wiimote Whiteboard. It is a fascinating video and will make you wonder why interactive whiteboards are as expensive as they are when you can make your own for $50.