Are you really stretching your students with Scratch?  If you are teaching KS3 then check out this tutorials for Scratch 2 here. If you are interested in KS2 or a slightly easier introduction to Scratch then head here. These are not your typical screencasts, oh no, each screencast sets the students a task to do and if they struggle to find the solution for themselves then there is a subsequent video that will walk them through it. There's an awful lot of content in there and we are betting that it will take the learners a lot further than they currently do in most schools