Here's a sweet little trick for searching LiveJournal's FAQs using Google. All that's needed is to include the phrase "faq question", the title that appears on all FAQ pages, and make sure your search results are restricted to site:livejournal.com. After that, you can enter your search terms as normal, more or less safe in the knowledge that your results will appear in LiveJournal's FAQ.
Hack that into a web-based form, and you have a search field!
Here's the code involved. Feel free to poke holes in it or suggest improvements.