That's so surprising I tried to find evidence of it online, but I couldn't. Partly because "index.php" is such a common thing that Google won't use it for a search term, which is ironic. Can you point to anything corroborating that?
Edit: that article appears to be mostly user names. Here's a forum thread to get you started: http://www.amsn-project.net/forums/index.php?topic=157.0
This is different from what Apple is doing, as it seems to be file-name based, to avoid phishing. I still think it's completely misguided.
That is hilarious.