It seems that some spammers were using the scripts for nasty redirects with external calls, and maybe stealing some PR.
HTML Code:
http://www.SomeTGP.com/out.php?link=www.SomeBadSite.com
Your scripts should test that they are being called only from the proper place.
Here's the link at the google help forum
(not adult friendly)
http://www.google.com/support/forum/...aa73cdf3&hl=en
And a link at damageX
http://www.askdamagex.com/f2/google-...ng-serp-37804/