matt_j_99 asks: "With all the talk about Ruby on Rails, I've been thinking about PHP frameworks. Ruby on Rails looks pretty cool, but frankly, I don't want to learn a new language. It seems that with all the slashdot discussion about RoR, somebody always makes the valid point that PHP is not a framework. But with PHP5's, Object Oriented features, a standard framework might emerge. Prado, Carthag, BlueShoes, and PHITE all seem like interesting frameworks. What PHP frameworks have you used in your applications? What were the pros and cons of each? Which framework do you think will have the best chance of long-term viability and maintenance?"