scriptygoddessThis isn't exactly a script, nor is it quite CSS. I got a tip from BaronCarlos that there's an XUL feature called the 'Site Navigation Bar' that you can customize in Mozilla and Opera 7.
If you embed four lines of code inside the <head> of your document, the browser will produce button for 'first', 'previous', 'next', and 'last.' I can see this as having some potential for sites which have mostly-sequential content, such as weblogs and journals.
From what little research I've done, it looks like the only code you need are these four lines:
<link rel="previous" href="[previous url here]"/>
<link rel="next" href="[next url here]"/>
<link rel="first" href="[first url here]"/>
<link rel="last" href="[last url here]"/>
To see the toolbar in action, go to View | Show/Hide |Site Navigation Bar. This is off by default, so you won't see it unless you select it.
I'm sure there are vastly more interesting uses for this sort of thing, but one has to start somewhere.
