You all probably know about Exposé's Application Mode (introduced in 10.6 I think). What's interesting is that while you're in it, you can Command+click on other running applications and bring their windows into Exposé as well.
Steps to reproduce:
- Open Application Exposé (click and hold on any running application in the Dock).
- Cmd+click on another running application in the Dock.
I noticed that some windows that are normally ignored by Exposé, appear while doing this.
[crarko adds: I tested this, and it works as described. It's something of an addition to this previous hint.]


