Apple offer updates for Snow Leopard printer drivers. They will be available from the software update depending on the model already installed on your computer. You can also directly get them from the following links:
Canon Drivers 2.2 for Snow Leopard
Brother Drivers 2.2 for Snow Leopard
HP Drivers 2.3 for Snow Leopard
Lexmark Drivers 2.1 for Snow Leopard
