zig not sure where your getting 9-22 from but our announcement on our site hear clearly says 9-13 was when 5.1 was released.
showproduct has a date of 1-31-2011 so that should be included in my notes was an oversight.
Otherwise what I have stated is true. I go by file dates when I make up the release notes. what I posted is correct. I do not include any changes files that have to do with a new install etc on an upgrade release announcement since they do not apply to what we are discussing.
with any install if your want to make sure your running stock code. You can safely unzip the download. delete the install and upgrade files as well as the two config files. delete the stylesheets data and uploads directories. delete any header or footer htm file from the downloaded code.
everything else can be uploaded if you want to be sure your using clean code.