There are some nice improvements with Windows Mobile 6, which make the AT&T Tilt a nice phone to use.
There is a task manager which is ever-present in the upper right of the Today screen, allowing you to close any application without 6 screen taps, as before.  This, like other improvements, accomplishes what 3^rd party applications did for Windows Mobile 5.  Another example is the icon which lets you change the orientation of the screen in one shot.
Also, there are more direct links to applications than before on the Today screen.

But an essential function of any phone is the ability to press a button to engage voice dialing.  With no dedicated button for this, I looked to see if there is a way to map a button to the voice dialing application.  Nope.  In fact the only such application is called “Voice Speed Dial”,  but apparently each contact had to be trained.  Not good.  Where is Voice Signal?

Some users looking to their phones to accomplish a quick task (such as send a text message or do an internet search, etc.) will prefer to not have to swivel and push open a device to use the keypad before they can type.  I’m realizing that I may be one of them, although the Tilt form-factor seems to be holding a long-term spot in the marketplace.