Porsche used Mahle, but recently switched to Hengst.
Mann and Wix also makes filters. You can see pictures of all 4 here.
http://www.renntech.org/forums/index.php?showtopic=9454&st=0
Fram also has a filter, CH8278. I have not seen it in person, just a picture of it on ebay.
Due to the design of the engine, you can change the filter without first draining the oil from the sump.