When you get to the app you want, hit alt-` (or you can hit alt-` directly if you're already on the app you want) and then you'll get a preview of all the individual windows.
This made me chuckle after just reading a rant about someone leaving Linux and going back to Windows because of all the secret handshakes and tribal knowledge required.
I made a video on how it works here: http://www.youtube.com/watch?v=XHFNnygpvcM