This morning Apple provided a new service for users to make things easier if support and service is ever needed. The Apple Support Profile is a central hub of information for you to keep track of your past and current Apple computers and devices, their serial numbers, warranties, and records of any service performed on those products.
Another nice feature is VoicePass. If you register your phone number(s) with Apple and allow them to use the number for VoicePass, the next time you need to call Apple, they will know who you are straight away.
Also, if you choose, you can have Apple send you a text message for service updates.
All in all, Support Profile looks to be a great resource for both the user and Apple.