For the record, here's a synopsis of some older projects and writing I started elsewhere. The first three at least are still pretty relevant:
Making maps with WebGL — this demo still gets praise when "geo" people see it for the first time. I used GPU-accelerated cartographic projection and texturing to animate a shape-changing map.
Unsafe at Certain Speeds: Dangers Designed into Django — tips and concerns architecting secure-by-design Django apps.