I’m trying out a plugin called Bad Behaviour. The idea is to stop spambots from being able to access the site. I haven’t had any problems with spam commenting lately, but I’m getting quite close to my monthly bandwidth limits, and keeping the spambots away should help to cut bandwidth usage so I won’t need to upgrade my hosting package for a few more months.
By all accounts this is a very good and reliable plugin and it shouldn’t cause any problems for human visitors (or legitimate crawlers like Googlebot)…