I recently set up the PS3 Media Server and it's been going great for the most part. Any issues that I had are usually fixed simply by searching the forums. There is one small issue that I have not been able to resolve.
I have three folders selected to show up on my PS3; music, movies, and downloads. When I'm in the downloads folder on the PS3 it generates an old image file as a thumbnail for all files. It was an audio book I thought I deleted a long time ago and I have no idea why the thumbnail is still there. Any subfolders within the folder generate the appropriate thumbnail. It's a minor annoyance but I wouldn't mind finding a solution.