CowPimp (who is taking donations for a digicam BTW, hint hint) has come up with a sweet way to cache your WordPress pages. I am going to try it out on this blog. From his post
This is a plugin for WordPress that caches pages. To use it, you simply install the plugin and turn it on. There is no need to edit your templates. Why would you want to do this? This reduces the load on the PHP interpreter and on the mysql database. It also allows the site to be fully functional even if the mysql database is down.
Download the cache plugin here: