Let the hive mind of Engadget get that for you.
"I'm in the market for a new phone and money isn't a limitation. I'm also not partial to any particular US carrier, but here are some of the features I'd like to have: WiFi, GPS, good coverage in lots of places, push Gmail (a must!), physical keyboard (a must!), a touchscreen, decent battery life and a relatively slim body. And please, nothing that has a fruit logo on it. No offense to the fruit fans, though. Thanks!"
"The Transporter really picks up where the Squeezebox left off in this department, adding digital output (in four flavors, no less)"
The Squeezebox does have digital outputs, two: coax and optical. Otherwise I wouldn't have bought it in the first place.
http://www.slimdevices.com/pi_squeezebox.html?#outputs
Otherwise, thanks for reviewing the transporter, sounds interesting.