The Apple strategy as I understand it, is to have all apps on the OSX and iOS platforms shared, download an app on your iDevice and its available on your iMac, iPhone and iPad. Also like Fran said all content is synced across the iCloud over a WiFi connection.
This can be done cross platforms as well, Android, Windows, Mac and Linux with Dropbox with minimal effort, With Dropbox I can have any file available on my Linux computers, Android phone, Android tablet, and my Windows partition as long as I'm connected to the intardnet to syc the files.
So you can get a Samsung Galaxy and use Dropbox to sync files to your iPad and Windows box.
And the I on any Apple product is in the lower case, iMac, iPod, iMac, iPhone, and iPad, it always has been. I hate Apple and its restrictions, but is it to much to ask for the fan bois and gurls at least get the capitalization right?
Without a Google who knows what teh "i" is for?
Windows strategy is to have the same OS across all platforms, PC/Tablet/Phone/TV and they seem closer then Apple with ARM platform being the exception.
Ubuntu Linux is lining up their cards to be the true cross platform all in one OS for TV/PC/Tablet/Phone.