The beginning of July this year has seen major new changes announced for Microsoft Windows 8 (shipping, perhaps, in 2012) and OS X Lion (shipping in July, 2011). iOS5 will see many improvements including things like "split keyboard" when running on larger displays.
Here's an overview of iOS5, Lion, and Windows 8 in about 15 minutes.... well, OK, I guess it's more like 28 minutes if you watch all of them all the way through ::-) :