I've just added a Google Maps and Google Earth map of UK Kite sites to my website. You'll need the Google Earth browser plug-in to see that version.
Most of the data is from a Google Earth .kml file that misterbleepy put online a couple of years ago (I hope that's OK Keith) which I've added to, so it's possible that some of the comments might be out-of-date, but I doubt if the locations have moved.
Let me know if you find either of these interesting and/or useful.