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You might have noticed that this site has been crawling halt with all the extra traffic it has been getting.
One thing to do is to use a low-memory footprint web server like lighttpd to serve images and other fixed content. The configuration file is a bit different to the Apache one, but if you can configure Apache you can configure lighttpd.
For Apache itself, I'm taking Stas Bekman's advice and limit both the size of the Apache processes and the number of processes spawned using the MaxClients directive.
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