I usualy stay out of these types of threads as in my experiance they just turn into arguments but I'm going to put my neck on the line here and say that whilst PHP is the most popular scripting language for the web at the moment (just look at sitepoint forums, programmingtlak forums, hotscript.com, etc) I believe that Microsoft will be making a huge push for ASP in 2008 which will see it claw away a little bit of the market share

Alan