The first class of the bike maintenance course I'm teaching at the New Brunswick Bike Exchange was tonight.
A few things came up: people wanted to see pictures of downtube shifter bosses like the ones holding my shifters.
Two of my tools caught their fancy: the Quik Stik:
... which is usually available at local bike shops, so I'm not linking to a source for it (go to your local shop, already!), and the Kool Stop Tire Jack:
... which is usually not available locally, although you should check. If not, you can get it at Universal Cycles, which is one of my regular sources; they carry a LOT of stuff.
And for homework: go find out who Sheldon Brown was, and why am I asking? What can you get from him?