I would like an Operating System which is open source.
Which has two options when its started for the first time.(Basic, Advanced)
Basic:my mother can use.Advanced: something a hardcore programmer hacker can use
which behaves like iPhoneOS/android i.e desktop with icons only(apps)/ no tray or task bar or menus or right clicks
apps can do what ever they want.
everything set to optimal default, plug and play, like boxee, xbmc (even they are a little complicated/clunky)
A single place to store documents,music,videos,settings,app store (with repository can use windows,linux apps).
A Closed App Ecosystem (only through repos like cydia)
no need of c drive,program files.

should have good games and social apps to appeal masses
In short, i want everything which iPad has and also the things it lacks.(multitasking,flash,plugins etc)
I guess future ChromeOS would be pretty close to what i want. There is also Jolicloud