After using DVD Cache for years, and receiving excellent support, the program broke under Snow Leopard. Several attempts to contact them resulted in no response. I did some research and found DVDpedia. My inquiry as to compatibility with Snow Leopard and whether it could import the database from DVD Cache was answered in three minutes! Answer to both questions was yes!
I downloaded the program and within 2 minutes had my entire database, posters and all, imported into DVDpedia. Much better program than DVD Cache!