Another issue I had was trying to re-install my Canon Pixma MP620 printer. The printer is connected wirelessly through the network and it took me a while to figure this out.
So for those of you who still need to do this or are having problems, try these steps:
1) Download the updatedCanon IJ Network Utility.
2) Run Apple's Software Update (I forgot about this and took me about an hour to figure this out)
3) You should be able to see your MP620 through the network now