A Leopard Ate My Website

If you can't view user websites after upgrading to Leopard, and your
directory permissions are okay, this page has the solution.

http://docs.info.apple.com/article.html?artnum=306884

And if you're using Filevault, you'll need to read this -

http://www.macosxhints.com/article.php?story=20071224093830773

though in Leopard, "chmod +a "www allow search" /Users/username"
works fine.