According to this post on the Unofficial Apple Weblog, Apple is making it easy for users to diagnose and repair hardware problems with their Macintosh computers at home. Check out the iMac G5 troubleshooting assistant. Note that it may be easier for Mac to offer this assistant service on the iMac G5 because there are so many less parts and screws than earlier models.
Is this the new direction for hardware manufacturers? Make your product so straightforward to diagnose and take apart that the users themselves can troubleshoot, order parts, and repair a product? There certainly seems to be no reason why not. Now when will they make it this easy to service your car?