DScripts
This guy's website is an interesting database of PHP, Javascript, XML, and more, scripts. They're the kind of scripts that are useful for when you want to improve your site or webpage bit by bit.
How about a live clock? Sure. Daily Poll? Secure Login Script? Thumbnail Generator? Yes yes yes.
They're the kind of things that you blow off as stupid - right now. But when you want a little thing on your website like the stuff this guy has, you'll be sitting there trying to remember where you saw it.
I, personally, already have some of the scripts he's got, but a according-to-browser redirect can be useful. IE (Internet Explorer) users go into a slow redirect chain of dumb webpages. Everybody else sees the normal website. Kind of funny.
Yes, I do hate IE.
But there's a lot more.
So, check it out: DScripts - "Free resources for web development!"