Looks like a fresh and trendy design, but there’s one thing: you’ve put min-width: 1440px; on the body-selector. Why is that? (I tested it on FF2 and IE7/Win)
Remember that alot of users are still on small screen resolutions, as 1024×768 is still a default setting on non-customized end-user machines. And some even use 800×600. Although you might not want to support 800×600 (sometimes I do understand that, since it’s hideously small), you should at least try to support 1024×768.