AT&T has flipped the switch on its Autonomous GPS service, which should help your aGPS enabled phone connect to the satellites much more quickly. (Surprisingly, AT&T hasn't had this enabled until now.)
"But Phil," you ask, "I already have GPS on my phone. What's aGPS going to do for me?"
To answer that question, we return to everyone's favorite WM Expert, Malatesta, who in January brought us a great tutorial on the kissin' cousins of the Global Positioning System.
Then step outside, fire up your favorite mapping app, and let us know in the comments if you can see a difference.