This year I've been working mostly with "manly con"1 so I've been outside most of the time, and away from computers, email, internet, etc. I took on the trebuchet item, and lead the design and construction of a kick-ass trebuchet with a 10lb counter-weight (the item specifically states that the counter-weight must be <=10lb; otherwise we would've made it bigger). We think we're supposed to fling calculators at a model building with it, so we're going for accuracy over range... I think we'll do well on this one.
Anyway, I've always wanted to make a trebuchet, and now I have.
1:Stands for manly construction, which does big construction projects with power tools, as opposed to "girly con" which is in charge of artsy craftsy things and making things we make look nice --membership to either cons, however, isn't gener-specific in any way).