From my referrers: http://www.php-soft.com looks like they sell comment spam software, used for comment spam, wiki spam and other stuff. It looks pretty efficient and somewhat advanced – enter a scriptname and it does a google search and spams all the scripts it finds.
Yeah I’ve been trying to think of a good way to block this program. The php-soft.com appears in the user agent in my logs in think. I’ve thought about just redirecting this to a new page when it hits my site. I wish I could get a copy of this and possibably find a way to crash it or make it fill itself with bogus data. For now it may just be redirected nicely.