Highlight is now available for Firefox 3.5, and can be downloaded here. If you're already using Highlight, the new version will replace the old.

If you aren't a 'Fox user, you can fake the Highlight code by including the following in a story page when quoting another source:

First type [q url=

then paste in the source, in quotation marks, i.e. "http://www.source-of-your-quote.com"

then a closed bracket: ]

Then paste in the text you're quoting. Just paste it in.

Then type [/q]

So it looks like 

The result will be:

So what you're doing is beginning a blockquote, quoting something, and then ending the block quote.

There. You just did some code. Cool.