Broadway - 2:19 pm on May 18, 2011 (gmt 0)
I recognize your example as belonging in a .htaccess file but otherwise don't know what it does.
My concerns aren't with traffic or visitors from the linking sites (I really doubt that I get any traffic from them at all, but I haven't checked).
Would the code above do anything to make me look better in Google's eyes? Something that indicates I want to divorce my site from an association with the linker?