@browncoat - At the moment, I think one of the best ways to get noticed for this kind of job is to try and work your way up through internet video. There are plenty of different companies that are using the equivalent of a TV hostess to do things like explain how to perform a task or use a particular product.
You might want to see if you can do some of this work, even if it's for free in order to get some experience on your resume. Try looking in the local art listings, as they often advertise independent productions. Try to make friends with up and coming directors and behind the scenes people. You might even want to try getting an agent.
It's tough to make it in this kind of job, but if you are persistent and polite to everyone you meet on the way, you will get there eventually.