Here's a list of smart phones where we have seen web font support with our own eyes. Let us know if you know of others.

Apple – iPhone 3G

Apple – iPhone 4

Dell Aero

HTC Hero

HTC myTouch 3G

HTC Nexus One

HTC Tatoo

HTC T-Mobile – myTouch 3G

Moto Droid 2

Motorola – DROID

Motorola Backflip MB300

Motorola Opus One

Samsung Galaxy S