I have grown very fond of Symfony 1.4. It’s pretty much Symfony 1.2 with all the quicks ironed out. It showed me how much polish is important in a software project.
It’s almost all I have been doing in my own little project after the main features were implemented, symfttpd: making it less annoying to use, less unpredictable, etc. And I must say, the current stable version has at least one very annoying quirk (but if it’s documented, does it count as a feature?).