This isn’t mind blowing, but it is a two for one.
Want to easily filter your list of tacts in the Contacts app? Just start typing on the keyboard.
What if you only have a virtual keyboard? Hold the “Menu” key until it appears, you can bring up the virtual keyboard in almost any situation by doing this. To close it, just hit the “Back” button.
Note added Tue, Oct 10:
The Contacts app filtering was tested on two physical devices, one running a stock Android 1.5 build, the other Android 1.5 with HTC’s Sense UI, and one virtual device running stock Android 2.0 build.