I've been trying to speed up a heavy WordPress site of mine for a while now, for example I serve the static images from another server, I have a WP Cache installed etc. One thing that I had missed until now was a Database Cache, so I've just tested out the one below
DB Cache Reloaded Fix
http://wordpress.org/extend/plugins/...-reloaded-fix/
and so far according to the speed test I'm using at Pingdom
http://tools.pingdom.com
it's now showing better speeds than I've ever had on the site since moving to Wordpress
It's early days, maybe it will all crash in a couple of hours, but I've heard other good reports to.
I write this thread in case this is of use to you

or in case Fris comes in to tell me I'm doing it all wrong
