I spent a couple of hours putting something together which allowed the plottable NOTAMS to be displayed in Google Earth. Having it on a dynamic Google Map would be better (thus no need for Google Earth) but the API doesn't or didn't allow one to draw circles, so you end up plotting loads of points to approximate a circle, but with so many NOTAMs that's a lot of data.
The problem with any of these type of things of course is all the disclaimers one must include which basically say "you can't rely on this, you have to check AIS". Still, it doesn't seem to stop people using fly.dsc.net - usage is going up and up at the moment.