There is a simple way to set a system wide ignore setting to make your svn client always ignore certain files.
First, make sure you have “show hidden files” enabled, then go to your home folder to .subversion folder.
From there, open the “config” file. Open up that baby and scroll down to the line with # global-ignores =
You can add any file extension there for your svn client to ignore globally.
I added the following for flashbuilder specific files that I normally would not commit to svn:
.DS_Store .settings .flexLibProperties bin- debug .actionScriptProperties .project .flexProperties