You can see the results of my efforts at my Mandelbrot set viewer.
I was talking to Phil today who suggested I look at OpenLayers. Sure enough, in their Gallery there is already a Fractal Browser which does almost exactly the work that I've already done!
Once again, somebody out there on the internet has already thought of the same idea. Nevertheless, I'm happy with my viewer (even though it's not everything I had envisioned yet) and I think I'll leave it as is and move along to something else. Finally, because this is Open Source Wednesday, you can find the code in ghewgill/mandelbrot on GitHub. Enjoy!