Dot-files and other meta data on non-Mac network shares
Is the file you're trying to copy using a resource fork?

If you're dealing with .DS_Store file issues run the following command in Terminal:

defaults write com.apple.desktopservices DSDontWriteNetworkStores true


If you're having issues with resource forks on Snow Leopard you may need to change your settings for the streams setting in smb.conf on the Linux machine or nsmb.conf on your local Mac. (._FILENAME files are the resource forks of the file). Check out Super User for more details on this.