The Dell 3008WFP has all inputs known to man if you need 'em. The Dell also has a scaler and OSD so setting it for accurate colors is easier and it does all resolutions (though in Windows you can set the graphics card to do the scaling). The Dell also has a circa 5 second lag when switching resolutions or inputs, which I find annoying.
I doubt the new Dell U3011 will be anything particularly spectacular compared to the 3008WFP. Many seem to hate the antiglare coating on the 27" so if the new one has that it might even be worse. Otherwise it probably just has the newer OSD found in the 27" and less inputs, which is IMO fine because I hate scrolling thru the composite, S-video etc crap.