Unless I'm missing something, there is currently no way to see how old a search result is on the site other than clicking on the post in question to see when it was made. Are search results ordered in chronological order, or relevancy? [more inside]
When a search results page loads, the focus moves into the search box (in the form with id "sform"), and I wish it wouldn't. [more inside]
Can the RSS feeds be hidden from Google? They're pretty much useless in search results (like the first hit on this one).
Robots.txt for the <tagname>.metafilter.com domains should exclude all rebots. Currently the robots reindex the entire site for each subdomain.
Metafilter ranks third when using 'weblog' as a search term in Google at the moment. Worth celebrating?