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If your MacBook's nonexistent Num Lock is stuck, check Mouse Keys
Bought a new MacBook with Leopard installed and used Migration Assistant (transferring from an iBook G3). Upon logging in to the primary account, the letter and number keys, Return, and some others stopped working. Returning to the login window, they continued to not work (as tested in the password-entry field) except for the Num-lock number pad region (which seemed strange, since this keyboard doesn't have a num-lock key or keypad markings). An external full USB keyboard worked normally.
The fix that worked (found in a web search) was to disable Mouse Keys (in Universal Access preferences).