Some websites I have found interesting (in no particular order):

Loading Scripts Without Blocking — Goes through all the options for including your external javascript files. I had no idea there were so many options!

Piston — This looks like exactly what I was missing from Django.

The First Rule for Software Development — When I am programming quickly, this is the first thing I ignore. Probably shouldn’t.

Rack Middleware for API Throttling — This looks like a perfect use for Rack.

SelectorGadget — This thing is awesome.

PHP Quick Profiler — I haven’t used this, but this looks awesome.

Facebook Will Become a Relying Party — I’ll believe it when I see it.