I've decided to post a compilation of webcams for Miami.

Long list of working Webcams all across Florida, including Downtown views of Miami.
http://www.abcwebcam.com/north_america/florida/florida_webcam.htm

Miami Herald Four Seasons Hotel web cam:
http://live6.truelook.com/face/newface.jsp?name=/ecodb/fourseasons&func=live&skin=FourSeasonsJan2005&overlay=default

Biscayne Bay webcam: -NOTE- This webcam shifts from Biscayne Bay, to Downtown Miami. I'm not sure why it does this.
http://www.wannman.com/cam/index.php

If anyone else has anymore, please share :)