I have not read this entire thread so apologies if this has been mentioned... I just happen to have the Sept 2004 issue of Air and Space magazine with me (I'm on a biz trip in Hong Kong) and I just finished an article in it called "Turn Off That Phone!" by John Croft. It mentions two or three incidents involving cell phones interfering with nav systems/etc.
If anyone wants a scan of the article, PM me and I'll get it out to you when I get back to the US this weekend.
Dave Blevins