[plt-scheme] Two new PLT Scheme web server tutorials

I've written a pair of tutorials on the PLT Scheme web server:

The first part covers how to output valid XHTML.
http://www.topmost.se/personal/articles/web-programming-with-plt-scheme/serving-xhtml.htm

The second part covers how to write a custom dispatcher.
http://www.topmost.se/personal/articles/web-programming-with-plt-scheme/custom-dispatchers.htm

If you have any comments or questions, feel free to contact me.