I just played the demo a little and I really like World of Goo.
But scrolling can does only work when moving the mouse to the edge of the screen.
Having the arrow keys for scrolling (like in most strategy games, e.g. StarCraft) would be great and it should be quite easy to add, too ;)

Oh and I forgot. Just a minor issue but related to scrolling so I guess starting a new topic for it isn't necessary:

I am using a dual monitor setup and the mouse isn't confined to the World of Goo window. So if I try to do edge-scrolling it wanders off to the second monitor and scrolling stops. But that sould also be very easy to fix I think.

Another dual monitor user here, so I feel your pain.

Disabling the "extend desktop" function for the course of playing the game works, though. Although it's not much of a solution but more of a workaround.

well scrolling ideas have been posted like crazy since the beggining, im guessing ron and kyle decided to keep the mouse only concept of the game (or they were just really lazy :P)