Here's a few pictures from when I replaced the front motor mount on our 2000S in April 2008
The one shows how the rubber mount was cracked around the circumference of the mount. I used a screwdriver to spread open the cracked rubber to make it obvious what was wrong.
The next pix shows a comparison of the old mount with the new one, shown on the left. This new mount is slightly modified from the original and the part number is: 987 375 023 04
I paid $207 (including sales tax) from a local dealership here in No VA.
It took about 3 hours start to finish doing the repair in my driveway. As already mentioned, Pedro's site and others have good write ups for the proceedure.
And no, I could not see that the mount was bad untill I pulled it from the car. I went on strong gut feeling that the mount was bad and bought from the local dealership ahead of time rather than order over the internet, thinking that it would be easy to return it if I was wrong. As you can see, I guessed right.