I'd like to make a small request - when submitting large, complex pieces of work for review, please either submit it as one giant squashed change, or be an absolute fascist about keeping commits logically clean and separated. It really sucks to review things in sequence and then discover that some code you spent some time thinking about or puzzling out got deleted/rewritten/changed in a later commit. It also can make it harder to review things when later code uses new APIs or behaviour changes introduced in earlier commits - you have to either keep it all in your head, do lots of tab switching, or do a squash yourself (in which case every reviewer would have to manually do that).

On a related note, github seems to have lost the plot with regards to code review - they are spending their time adding 3D renderers to their diff viewer but not making basic improvements other tools had for years.

So, I'd like to suggest the idea of using Review Board:

It's an open source, dedicated code review tool used by lots of big name companies for their internal work. It has git[hub] integration and a lot of very neat features, like the ability to attach screenshots to reviews. Also more basic ones, like side by side diffs. Branches can be and often are submitted to the system as single reviews.

The company behind it (disclosure - written and run by a long time friend of mine) offers hosting plans, but we could also host it on a Foundation server instead.