The Qibla Locator has a new home today. www.qiblalocator.com. It will also be available from its previous location at ibnmasud.com/map.htm till it is fully indexed by google and others.
The new domain was bought from Yahoo but the site itself is hosted on Dreamhost which also hosts ibnmasud.com.
Assalamualaikum,
I found your blog when I search about qibla locator long times ago, and since Firefox 3.5 (RC) can support geolocation feature, maybe you can add user location detection directly using geolocation feature in Firefox 3.5. Checkout:
http://www.mozilla.com/firefox/geolocation/
Thanks!