Have to agree with that - Children of Men was awesome. The final gun fight was an impressive scene, as was the 'marauder' ambush when they were driving to the resistance base. Good soundtrack as well - I love the Franco Battiato (spelling?) cover of Ruby Tuesday.
Another camp post apoc classic is Hell Comes To Frogtown starring wrestler 'Rowdy' Roddy Piper as the titular Sam Hell. Absolute gem