I made at presentation on September 1st on our XQuery implementation at the International Conference on Very Large Databases at Trondheim, Norway. The paper contains a lot of useful information, which, I hope, you will enjoy. The link is: http://www.vldb2005.org/program/paper/thu/p1175-pal.pdf.
I'm adding this link to the left pane as well for future reference.
I hope you like the content.