A number of people who have just updated to Snow Leopard are still running into printing problems now that Apple has dropped AppleTalk support in OS X.
Guide to Mac-friendly wireless routers: AppleTalk support
Mac-friendly wireless routers (#2): Which units support AppleTalk devices and work well with AirPort hardware?
Apple Mac OS X AppleTalk Local Denial of Service
Problems accessing AppleTalk over AirPort networks with Intel-based Macs (#2)
Problems accessing AppleTalk over AirPort networks with Intel-based Macs
MacBook Pro (#13): Whining noises -- more fixes; AppleTalk printers not showing up over AirPort; more
Security Update 2005-007 1.1 Special Report: AppleTalk over Ethernet broken for some
Mac OS X 10.4: AFP access problems: AppleTalk no longer supported, workaround; more
Mac OS X 10.4 (Tiger) #9: How to get AFP working: Mac OS X 10.4 no longer supports AFP over AppleTalk, use TCP/IP instead; more