Upgraded to Lion on every machine but my main desktop. I am extremely frustrated that, for no apparent reason, they decided to reverse scrolling behavior, both with trackpads and scrollwheel mice. At least I wish this was configurable in the mouse settings. In other words, if you roll the scroll wheel down it used to move the scroll bar down. Now it moves the scroll bar up. I guess they are going for what happens to the DOCUMENT/VIEW, as if you are pushing the document up or down with your fingers, but it's damned confusing and the first time I can remember this behavior being questioned since it was introduced -- when? Mid 90s?