Google tips for an accessible website

Over on the Google Webmaster Central Blog they've posted an article on creating accessible, crawlable sites.  Since it's coming straight from Google's mouth it's probably a pretty good read if you're interested in making your site as easy to crawl and index as possible. 

Ensure that all critical content is reachable
Basically don't use JavaScript links, use links in <a href=""></a> tags.  They don't mention it specifically, but I would think all Flash sites would fall under this problem as well. 

Ensure that content is readable
Spiders don't execute JavaScript so anything that's put on your site via client side scripts won't be visible to the crawler.

There are a couple of other thoughts there too, but I don't want to copy too much over.  It's a pretty interesting article if you're into that sort of thing.    And that blog is a good one to follow if you're doing your own web work.