Thanks scoop for yet more info... The build was made 020703, so 10 days ago now.
MMC is back (problem with 3657), so now you can administrate the AD true links in Administrative Tools.
IIS Security Lockdown Wizard is still gone (like in 3657). This can cause problems with hosting website.
Server Management is a new program (MMC based) in Administrative Tools. Windows has also got a new user group called Server Operators wich I assume has been created because of Server Management.
Besides that 3660 looks like 3657, and is running smooth. Looks like a great build.