To make it easier for the administrators, everyone is invited to post spammers in the format of:
This results in a link where all of that user's contributions can be easily accessed:
As it is clear that this is only a temporary work-around, confer to the current discussion in the forums for a long term solution that is still to be found.
Blocked spam accounts should be deleted from time to time to keep everything neat.
A list of already blocked IP addresses and usernames can be accessed under Special:Ipblocklist.