In Leopard, after activating Exposé in All Windows mode with the keyboard or mouse button, you can view all the window title overlays by holding down the Option key, instead of seeing them one at a time on mouseover.
[robg adds: Simple, undocumented to the best of my searching abilities, and very very useful!]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20071121224930191