Here is a very simple report that I'd like to contribute to the dotProject community.
I wrote this just for my company internal use.
If you want to try out, simply copy these two files to the /modules/project/report directory.
Then select "Project"->"Report"->"Export to XML".
It will select all projects and export as a XML file for you.
PS.Not sure where is the right place to post, please forgive me.
Export to XML
Export all projects info to XML