This looks interesting. Would be suited to the advanced level 3 and 4 student wanting to go further than the usual 'design your own bedroom" or draw a floor plan of your dream bedroom.
Very useful wiki for people looking at introducing gaming into their classroom or school. Loads of examples of games that could be integrated into the curriculum. I am about to loose some time checking some of these out.
Interactive site on simple and compound machines (It lists "gears" as a simple machine, which is the only place where I have seen this, as everywhere else just has the traditional 6 simple machines. Likewise, some of the examples of various machines are a bit tenuous, but it is a fun site, nonetheless)