Sync
Fraser Speirs nails the problems with multi-computer sync, concluding:
It leaves me a bit glum that we, as an industry, have pushed on this for so long and are still hurting users daily with complexity and failure.
I’ve also been very disappointed with sync, although not enough to give up the incredible performance and capacity of my home and work Mac Pros. Until I can get an affordable 250-500 GB SSD in a laptop (probably at least 3 years from now), I’ll never be satisfied with laptop performance enough to use it as my primary computer.
But good sync makes most laptop limitations less relevant. If someone could offer reliable 2-way sync for some key applications (iTunes and iPhoto would be huge), especially if they incorporated basic versioning and backups, they could make a lot of money.