Thanks Tim.
Summary of my fix: I updated the web.config file to the version containing the configuration for url rewrite. I got this version from the Web Ready release build.
Your reply gave me a much needed clue and led me to the fix for my problem. After reading your post, I realized that my site quit working when I uploaded the Web Ready kit, which I purposely loaded over the RC 1 build. I loaded all but one file, the web.config file. (I did this because I didn't want to overwrite my connection string, forgetting that the connection string is located in another file, the connectionString.config file)
I pulled down the web.config that was being used at the time that url rewriting was broken and compared it to the local version of RC 1 and also compared it to the version in the Web Ready build. Sure enough, I noticed the difference right away, the references to url rewrite were not in the web.config file I was using.
So my fix was to load the Web Ready version of the web.config which contains all the necessary references to url rewrite and the site started working right away.
I didn't have to go to urlrewriter.net and download anything because the Intelligencia.UrlRewriter.dll that came with the Web Ready build was already in the bin folder (which I uploaded when I upgraded from RC 1 to the Web Ready build)
Phillip