While few will notice the difference (or care), I converted my homepage from .Net to PHP for the heck of it today, thanks to the ASP2PHP converter. Sadly, I don't know how to port my XML quote app to php yet, so it's running from my MySQL database for now.
Sorry, Bill, .Net just wouldn't cut for a high-demand bleeding-edge site like mine :-)
Correction: rationalmind.net still runs .Net but rationalmind.net/David runs php -- which means that I can do some interesting speed tests...