I installed a WordPress plug in called SA-Autolink that automatically links words. You enter a word and a URL and everywhere that word is used, it will be turned into a hyperlink to the URL you provide.
I did this for words like WordPress and Dreamhost. Only problem is it does links inside of links. So the Techoncrati tags get double linked. The words use in titles gets double linked.
I need to go through and the code and see about making it not do things already inside a link. But not today.