I don't usually start threads here. But I have been researching ways of improving my wordpress blog's page load times since it's not only becoming a usability issue, but also is being considered as a potential ranking factor in Google's Caffeine.
I've primarily focused on caching solutions/plugins. But I've read about various problems with these. Then last night I stumbled onto what I think is a brilliant way to improve wordpress performance without having to add yet another plugin to a wordpress installation.
The change was suggested by Jim Morgan, and Apache/Mod_Rewrite guru (to put it mildly). I replaced the default code that WP installs in your .htaccess with Jim Morgan's optimized .htaccess code, and I was truely amazed at the results. It cut my page load times from 4-8 seconds down to 1-3 seconds.
Hope you find this useful. Show you implement Jim's changes, let me know here if you too see noticeable changes in page load times.