I love having my iPhone "untethered" that way I can use apps, the phone or text (when stopped of course). I think the idea of using traffic camera apps while driving is a poor choice. Anything that will take your eyes from the road is a bad idea. I realize the "pull" of the iPhone apps too, I love that thing and I know that if I'm focused on what the phone is doing my attention is not on the road.
Just my 2 cents
Sig Starts Here :)

Current:
'08 3.2 A6 Avant Quattro
Ibis/Black, S-line, Premium, Technology, AMI, Nav, 19" RS4s & sport suspension
Mods:OEM S6 Carbon Fiber interior trim, S6 Bumper, S6 LEDs, "S-line badge" over passenger airbag light
Future Mods (in order of expected completion): debage "A6" & "3.2q", side marker delete, tint, brushed aluminum mirrors
Audi Addiction/Serious Problem :)
'04 A4 1.8t Ultrasport Light Silver Metallic/Ebony
'05.5 A4 2.0t Brilliant Red/Ebony
'06 A6 3.2 S-Line Misano Red/Ebony
'06 S4 Brillant Red/Ebony
'07 A4 Avant S-Line Brilliant Black/Ebony
'08 MkII TT Coupe 3.2Q MT6
Brilliant Red/Black
'07 Q7 3.6 Quattro
Light Silver Metallic/Ebony
Premium, Technology, Open Sky, Cold Weather