This is an amazing site that allows you to share your screen live with up to 250 viewers for free. You can even view the screencast on ipad/iPhone and Android phones. Perhaps most exciting of all is that you can use the site to control the viewed computer remotely, a useful feature for fixing any computer problems from afar. You need to download a small file to start sharing.
http://ictmagic.wikispaces.com/ICT+%26+Web+Tools
A great set of interactive space resources. Learn about day and night, orbits, phases of the moon and more. Choose a topic from the menu and explore with your class.
http://ictmagic.wikispaces.com/Science
Terry Freedman from the UK makes some great points about expertise in Computing. This is particularly relevant in the UK where every student age 5 and up is expected to be taught programming in school. (Wake up world.)
Terry says:
"Some Principals and Headteachers think that a good way around the problem of teaching computing is to not worry about whether teachers have subject knowledge at all. "All we need are facilitators", they say, "while the kids can teach themselves and each other." This is, as any teacher knows (or should know), easy to say, less easy to do, and not altogether the most desirable thing to do even if you can do it. However, just in case your school happens to be "led" by one of the aforementioned Headteachers, here are some arguments you may want to use. I think that any one of them should suffice, and all of them together make for a cast-iron case."
Read more... this is a topic that will be increasingly discussed in other countries.