To make it easier on administrators, everyone is invited to post spamming users in the format of:
This results in a link where all contributions of that nick can be easily accessed: Hellwoofa
As it is clear that this is only a temporary solution, confer to the (not so) 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 blocked IP addresses and usernames can be accessed under Special:Ipblocklist.