Just had one of those stupid Airport Extreme wireless hiccups - lost the Internet, my wireless network completely disappeared, and I had to call Apple after I tried all their fix steps to no avail. This time they had me reset the Airport Extreme, thereby losing all my settings, but it got me back on the Internet. Then they switched me over to a wireless expert, and we talked through everything - put it all back the way it was in terms of passwords and naming the network and all is well. He did say it's probably someone else's wireless signal colliding with mine occasionally - this has happened four times this year. He said he could put me on a new less-used frequency, but the problem is it's only compatible with my MacBook Pro and would then not allow me to get on the Internet on my backup Powerbook, which we use for LACCTAA business, so I left it alone, but if it happens one more time then that's the next thing I do and the backup computer will have to live without Internet.