Thank you for the link. I just installed it and my PS3s are working great with MediaLink on Snow Leopard again.
I wrote Nullriver twice and haven't heard anything back. I can't believe a company like that would not have tested with Snow Leopard prior.
Anyways, if you want a fantastic alternative to MediaLink, check out "PS3MediaServer". This is a free software from Google that kicks MediaLink to the curb. Check it out at
http://code.google.com/p/ps3mediaserver/
They have Mac OS, Windows and Linux versions. I tried it on Snow Leopard and love it. I promise you, this is the best MediaServer out there for the PS3. Love to be able to have movie cover arts showing on the PS3. Just simply put jpgs with the same name as your movies that is it. (Ex: Flawless.mpg Flawless.jpg).