I hope you're not suggesting I concate massive strings? When I researched every place advised against this.
(Despite its name XMLHttpRequest is not limited to only XML.)
Yes, I use XMLHttpRequest to pull data from non-live websites and make live pages from them. It worked with plentyoffish, but I didn't publish it
My HTML headers, when used in real projects, are in includes as well.
Something I like about php, is the fact you can use conditional includes which helps, although I try to keep the ASP and PHP ones as similar as possible so I can update either easily.