I switched moria.org.uk to use the lighttpd web server at the weekend. Partly so I would have more free memory on my VPS account, but mostly because 'engineers love to change things' :-).
One significant little feature was missing though — an external log splitter like cronolog was only supported for the access log. Personally, I find using something like this easier than log rotation, as it makes it easier to find the logs for a given day; and clearly if you want it for one log, it makes sense to use it for both. So here is a patch.