Courtney wrote:will this create a way for me to check on sites that don't use XML?
I think you're on the wrong track for what you want to do. OPML is way to store a list of channel URL's, usually so that you can transfer your subscription list from one machine (or reader) to another.
But I'm guessing what you want to do is monitor a web site that doesn't publish an RSS feed. The easiest way to do this is use something like www.myrss.com
and create a new channel there. They will regularly check the web site and try to figure out what is of interest on the page. It's all done automatically so the results can be a bit variable sometimes but it generally works OK.
There are other ways of monitoring sites that don't publish a feed but they are a bit more involved. Give myrss.com a go and if you need something more, let me know.