At some point awhile ago, any address card in my address book that did not have a name (but did include an email address) has been corrupted to show (null) in the name column (where it used to show the email address).
I've uploaded an attachment so you can see an example.
Link:
Mac OS X Snow Leopard (although I believe this started in regular Leopard)
2.4 GHz MacBook Pro
Anybody have an idea how to fix this?