Any ideas which ones I missed?

Ya know, I NEVER ever noticed that Search function before. But anyway, you're right - you can do it like that, but with this people don't have to risk messing something up, they can change it by changing one template, and they can add it to any other area of their site. I used to think the same about vBHacker, then I found a hack that only had a hack.php file - tried it, and never looked back since!