The relative URLs should still be the same. For example, if you are looking for the alternate rules for Passions, which used to be http://www.cis.upenn.edu/~lwl/proj/passions.txt, you can now find it at http://www.access.digex.net/~lwl/ars/passions.txt
If you are using Netscape, you will be taken to the new Ars Magica page in thirty seconds; otherwise, click on this link.