October 23, 2001: <rant>*ahem* Unless I'm missing something, CSS should allow multiple classes.
For example, say you have multiple submit buttons on a page. Say they fall into two groups, some of which look one way and some another way. But say you want them all to get the same basic style. You should be able to do:

.button { background-color: black; color: orange; }

.buttonBold { font-weight: bold }

And then..

<input type=button class="button,buttonBold">

and have it look like:
Dont'cha think?</rant>