At lunchtime today I was poking around and discovered this tip from Steve Smith (presumably not the minister for foreign affairs).

I've implemented it, and it works a treat, so now you get three similar posts at the bottom of the page (just before the comment section) in case there's some more reading on the site around the topic you're tracking.

The only problem, though, is that it does seem to slow down the "view post" pages quite dramatically. So let me know if you think it's worth the tradeoff ... are slower post views acceptable for the nifty "similar posts" list?