Snow Leopard seems to have an endless number of tiny tweaks up its sleeve, and here are a few more morsels. In Exposé, when your mouse pointer is over a window thumbnail, press the Space bar to expand it (press again to return it to its minimized size). This will interest only programmers, but Quick Look now applies syntax highlighting for source code files in at least some programming languages. If the Trash contains locked files, emptying the Trash displays a new dialog that gives you the option to delete all the unlocked files, rather than repeat the action with the Option key held down to delete everything. In the Icon view in a Finder window, if any filenames overlap, the names in the background turn gray. It's a nice tweak to avoid the solid block of black that happens when lots of items are stacked on top of each other.