Hrm.
I've tried about 5 times to get time to write a post about City of God and Shaun of the Dead, and I have yet to do so for various reasons. Rather than put it off any longer, I'm just going to say it.
City of God and Shaun of the Dead are both amazing movies that you should go out and watch at your first available opportunity. One is a powerful, well-shot movie about the slums of Rio that fully deserves its Oscar nominations. The other is a wickedly funny Dawn of the Dead parody from the UK.
Go watch both now.