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In CCC, go to the ATI Overdrive tab, it should be the very bottom on the menu on the left. After you click on the key to unlock the Overdrive functionality, there should be a drop-down menu that you can click on and select the 2nd GPU to see what its temperature is. Normally for me, GPU0 idles at 45-50C and GPU1 idles at 40-45C. For my idle state, though, I drop the core and memory clocks as low as they'll go and set the fan at 35%.
the difference in temps is because since the gpu's are in a line, the gpu furthest away from the fan is recieving warmed air from the gpu closest to the fan... resulting in the different temps
I'm personally not comfortable with the temps my 4870x2 is running at. I've see it go up to 91C under heavy load and that's way too high for me. I'm going to WC for the first time because of this card.
What fan speed were you running your card at? i run mine at 50% and i reach 85C full load. i idle aroung 57C