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Everyone should really be running PHP 5.4. In a lot of benchmarks it is almost twice as fast as 5.3, it's just starting to get features it should have had. Zend framework runs a LOT faster. You can find countless benchmarks online, Wordpress runs about 10% faster and less memory footprint, etc.
And I'm not even talking about the numerous security issues that have been fixed in 5.4. People complaining that their scripts don't work really should read up on the errors and upgrade their scripts to the latest versions. Like mentioned before, there is a reason a lot of scripts don't work. Many hosts still run 5.3 though and that's a shame, and still running 5.2 is just laziness in my opinion. You'll be sorry when someone exploits your server or wipes out your website.
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