Apple's page trumpeting sync services in Tiger makes it sound great:

Sync Services Supplied
Tiger advances the state of the art by integrating intelligent, high-performance sync services right into the operating system. In Tiger, the preferences and controls for what, when and which devices you want to sync appear inside your favorite applications, such as Safari, iCal, Address Book and Mail — including multiple Mail accounts, Mail rules, signatures and Spotlight-driven Smart Mailboxes.

Indeed these features were prominent two years ago when Tiger was making its way to release. It is puzzling then that the state of sync is so poor in OS X. Here's a brief list of the most disappointing: Read more about The problem with sync