Head over heels for gadgets!
While .DS_Store files may be useful in the OS X environment (like a Thumbs.db file in a Windows environment) they can get in the way when you're working in Subversion or Git repositories. They have no place there! Fortunately, there's a quick way to get rid of them!
find . -name '*.DS_Store' -type f -delete
As usual, I recommend making a backup and make sure you're running the command in the root repository folder. You can of course adjust the path as necessary, but I run my commands while in the root directory just to be on the safer side of things.