I just purchased a cheapo £15 DP--->VGA adaptor from ebay. Works a treat, picture is as pin sharp as DVI from my second 5850 was.
Now my 2 * 2007fp and 3007wfp all running nicely from a single 5850 =D
new user here. i have a similar setup with a 3007WFP and two HP LP2065s in portrait mode for a 1200x1600-2560x1600-1200x1600 setup using two video cards, one of them being a 5870. I was under the impression that:
1) Eyefinity didn't support portrait-landscape-portrait
2) resolutions had to match on all three monitors
3) the DP-VGA adapter had to be connected to the highest resolution monitor, which in this case is the 3007WFP which only as a dual link DVI input.
i was under the impression that you were using Eyefinity, but maybe you meant to say that you were able to output to three monitors simultaneously on desktop applications? Can you actually game on all three monitors simultaneously?