I noticed this problem when creating templates using the file system via TextMate.

When I created a new template such as example.html and saved it, I’d notice an additional template being created called ._example.html

As far as I’m aware this is a TextMate only issue and can be resolved by opening Terminal and running this command:

If you want more info on why this happens then look at http://manual.macromates.com/en/saving_files