2000 986S with a minor shudder/vibration as the revs pass through 3K (most noticable in second gear).  
 
A quick search reveals that I could have a deteriorated motor mount.  One thread said the mount is visable by removing the panel behind the seats.  I looked last night and didn't see anything that resembled the pictures of bad motor mounts.  
 
Where do I look?  Anyone know of a link to a relevant picture?
 
Thanks,