favorite-proofs.pdf is an incomplete 'zine of my favorite proofs.
Here are a couple of old homework assignments that might be fun to look at
20041029.pdf I like the look of the inequality on the bottom of page 6.
Inspired by Counterexamples in Topology and a looming exam, I made this graph. Solid arrows are implications. Dotted lines joining a blank node are read as "and". For example, in the lower left you can read that a space that is Separable and Metrizable is Second Countable.