We use centrify (Active Directory-based auditing, access control, and identity management for your UNIX, Linux, Mac OS, Java and web platforms from Centrify), this allows users in AD to log onto the Mac's using the same password and user name as in AD.
Also you can manage your Mac's using group policy and as long as your file store is on Windows Server 2003 or an Apple Xserver you can map these shares. Windows Server 2008 file store will work when apple releases a fix... duh
Oh yeah you can also print to a windows print server... very easy to use