I'm supporting a moderately trafficked Wordpress server, with 2GB ram and a dual-core amd opteron CPU, running Gentoo. It looks like it's just a default install, so I'll be tuning mysql, but I'm also planning on dropping in one of the various caching plugins for wordpress.
Which plugins should I consider for this? Are there any significant differences between them that I should take into account while selecting them?
This article on coding horror suggests WP-Cache, WP-Super-Cache, or Bad Behavior - are there other plugins out there to include in my quick survey?