A way that has been touted recently (which I've been doing for a while is to use the advanced google.com search parameter that limits results to a single domain.
For example, enter: "SJackson" site:freerepublic.com
in the google search text box and you'll see your own posts. (Or one's with your username referenced.)
Thanks, I use that a lot, and it works well if you can come up with the right phrases. I always wished FR had an author search, it would also help in eliminating duplicates where varous publications use different titles for the same article.