An eyefinity edition 5770, very interesting. I got the email about the single slot 5770 but i didnt notice the eyefinity version, i wonder how well it will handle that many screens.
As long as the cooler can handle the heat, its not really any different than a double wide 5770.
Though it would allow for better air flow if using 2 cards and allow for using the PCI (or PCI-e x1) slots on some MOBOs that double slot cards tend to block !