This also needs proper VCS support - by which I mean DVCSes that let you pile commits up to the same files one after another sanely, or reviews after commit rather than before (better have a good branching setup!)

My last job was perforce (no unsubmitted commit stacking) with everyone developing directly against a single branch. In theory, code reviews were supposed to happen before hand.

In practice, I submitted small changes from the hip, and complained when my coworkers gave me a week long spitball of unrelated features in a single mega-commit. Not that I wasn't guilty of that myself. Bleh.