!!!-***Bug 550 is going to be fixed soon***-!!!
Tim Starling announced on the mailing list that very soon, probably within 24
hours, the way the block function works will change.
Most important changes;
Allow blocks on anonymous users only (bug 550) ; this means that registered users who are using that ip address still can edit, like users who on the network of a school or need to use the proxy of there ISP
Allow or disallow account creation from blocked IP addresses on a per-block basis
Here you can see a screenshot form the new interface;
For more information read the posting by Tim Starling;
And even more reading;
Lets rejoice ourselves, spread the news to all sysops on all +600 Wikis and celebrated this wonderful day!