fosk.it! 2.0

To configure a Mac OS X user account so that .DS_Store files are not created when interacting with a remote file server using the Finder, follow the steps below.
Note: This will affect the user’s interactions with SMB/CIFS, AFP, NFS, and WebDAV servers.

Open the Terminal.
Type:
defaults write com.apple.desktopservices DSDontWriteNetworkStores true
Press Return.
Restart the computer.

If you want to prevent .DS_Store file creation for other users on the same computer, log in to each user account and perform the steps above—or distribute a copy of your newly modified com.apple.desktopservices.plist file to the ~/Library/Preferences folder of other target users.

These steps do not prevent the Finder from creating .DS_Store files on the local volume.