Integral features, that have distinct usability.
For example, TimeMachine vs any Backup solution on Windows that I have ever come across.
Now, Chinese Character input, on your trackpad.
Civilized, Ordered, Advanced
Recently Lucas Mearian wrote an article for Computer World titled "What your computer's drive(s) will look like in 5 years".
I found the article interesting except I disagree in one significant way.
Computers won't have just one 'Drive'
I believe computer's in the not-so-distant future will have dedicated and quite possibly on-system-board SSD for the Operating System with very high performance, but a relatively minimized capacity (let's say 10-20 GB).
A regular HDD, but removable, will be used to backup the image of the OS Drive and contain all of the personalization relevant to a particular user including Documents/Media and Configuration/Settings.
By being removable, this allows the "personalization" of computers to be portable.
This also allows a 'standard' configuration (more appliance-like, in my opinion) of the hardware to be shipped by hardware vendors and offsets the flexible drive sizing responsibility to the customer.
A side benefit is that when computers are built in this manner, it allows your data to be removed such that turning it over for service does not expose your data to a repair service and also makes loaning and retirement of systems more secure in a way that most users could blindly understand (I "ejected my data").
You could even use the drive as part of a 2-Factor Authentication for securing logins.
Some people say that Cloud Computing and related services offsets the need for such solutions, and that data will eventually live in the cloud, but I really see the desire for security (both privacy and availability) to be an expectation of users until network performance can match that of the slowest local disk and security mechanisms becomes more transparent.
I actually built a working prototype of a very similar solution on Windows a few years ago and tried with the help of Bill French, Brad Feld and the folks at iSherpa, to bring it to market.
I still think there is a significant need in this space to help users deal with privacy, cost and reliability.
The industry has provided some interesting stop-gap solutions but none that deal with the fundamental issues.