It's a universal keyboard shortcut! Win + Space and type the first few letters of anything. It'll guess what you're typing about. If it doesn't guess right, just keep typing, or use up and down arrows to tell it. Over time its guesses get better.

It sounds cumbersome when I describe it that way, but what it really amounts to is effortless everything. No delay between thought and action, and your hands never leave the keyboard. Plus it's got plugins that integrate with your bookmarks, your Tomboy notes, even your file system, so you can launch everything using GNOME Do. It's unbelievable the level of control that it gives, and how easy it is to use -- especially since it's all just one shortcut.

It's also an object dock, but that's optional. Sleekest and easiest dock that I've ever seen, though.