I've installed this now on
www.planetmgc.com and it seems to allow good ip address anyway.
Already seen a dramatic drop in spammer registrations. I've also blocked a couple of spammer bots that were chewing up CPU cycles including Yanga World Search bot (check it out on google). It's used by russians to spam harvest .
I've also just banned the entire Russian Federation IP range (find-ip-address.org) and entered this into .httaccees so that no Russian servers can even get to my site.
No one from Russia is likely to join my site to be honest anyway so it's a no brainer.
There are a couple of other tricks and hacks mentioned which I may use later on. But for now I'm a happy chap. Thanks Pedigree.
Going from 20-30 spam registrations per day, I've seen no new spam registrations yet.