tedster - 5:48 am on Nov 15, 2009 (gmt 0)
As you can see earlier in this thread, there are differing opinions. My own view is to file right away and get it on record with Google. Part of my reasoning is that trust calculations seem to run a lot less frequently than ranking changes. If you wait until whatever week a penalty kicks in, you don't look nearly as "clean" to a human reviewer.