ATI just uploaded non beta (thus final) Catalyst 10.7 drivers and its release notes:
New Features
This section provides information on new features found in this release of the ATI.
ATI Eyefinity - HydraVision enhancements
- Maximizing a window across displays will now take user defined bezel compensation into account
- Automatically adjusts window position when dragging and dropping windows to ensure title bar visibility
- Proper dialog box placement - dialogs do not cross displays, are not hidden behind bezels, and can be designated to be shown on the users
