I could see this same gestural/persistent-floaty trick being useful on iOS (and similar full-screen foreground or touch environments) as well.
(Though, reserving a side of the screen as a clip-dock would be an obvious touch-OS alternative, and might work better on touch screens than it would on a desktop. On the desktop, the corners and edge are already heavily colonized with meaning.)
I could see this same gestural/persistent-floaty trick being useful on iOS (and similar full-screen foreground or touch environments) as well.
(Though, reserving a side of the screen as a clip-dock would be an obvious touch-OS alternative, and might work better on touch screens than it would on a desktop. On the desktop, the corners and edge are already heavily colonized with meaning.)