I'm a big fan of the Plano clamps. They mount on the wall so they're out of the way whilst the glue cures and like the example above, they hold the boards flat to each other. They're a bit fiddly until you get used to them, but well worth the effort.
Those look like a pretty good alternative, although I'd say you might not get quite as much clamping pressure with those wedges as you would with the Plano's screwing clamp heads, but it might very well be enough for well-jointed edges.