Test-driven Development

So I've been reading more about this test-driven development stuff and it makes me cry cause i think about work and how none of the stuff we write is properly tested. We still do things the old way where we write until the feature we're adding is complete then test it after it's done manually. I don't know how we're writing proper testing for things like the recorder/uploader applet, but it would sure as heck beat sitting around uploading random files all day and checking logs/consoles and crap.
That's the other problem we have is the broad scale of things we have in our site. We have everything from javascript to flash players to java applets all over the rails base we built the site on, and that makes things complicated.