Handedness, GUIs, and Outliners
Reading Danny's bit about Treehandedness reminds me that I've been meaning to mention something about outline UI for awhile now. And that something is this: Why are the disclosure triangles on the left, yet the scroll bar is on the right? I think it's left-to-right reading and the visual semantics of a bullet point colliding with the general right-handedness of most GUIs. If you're a lefty, you may have a different take on this. But at any rate, if you take a peek at my latest in aggregator UI design, such as it is, you'll see that I've opted for sticking the triangles on both sides and clustered the per-item controls over by the scroll bar on the right. You shouldn't need to bounce your mouse from side to side on the screen to interact with this stuff.