There are some amazingly cool ideas for OS X in the Fake Leopard Screenshot Contest. The winner, Eric Patterson, should be hired by Apple asap, and there are lots of great ideas for both apps and OS X.
I especially liked Nathan Ziarek’s ideas on how to share music between members of a family. Infact, Apple should take this even further, and make an Xserve for families.
It could work like this: A special Xserve with special Apple software is installed somewhere safe in your house, a place cold and where no one can hear it. It is used as a central for all media of the different Macs in the house. It stores backups of all pics in iPhoto, all music in iTunes and everybodys documents in general. When someone enters new music on their Mac, it’s sent to the family Xserve so others can use it, both in iTunes and on their iPods.
The family Xserve should also have a tv-tuner and an EPG, making it possible for all users in the house to plan recordings even if they where “off-site” with their Macbooks.