Maybe not a "suggestion for improvement"
per se, but this is still an interesting website
Stop Forum Spam:
Stop Forum Spam - Forum Banlist
They detect most of the spammers trying to register on forums, and post their details on the site (
username,
IP address,
email account and
country). They currently have information on 33000+ spammers since about December 2006.
They have a search function where you can search for spambots (or any other suspicious looking registrations) many of the spambot usernames register with hundreds of forums at the same time, so they can be more easily detected.
In addition to username, the list can also be searched by IP address or email address; its a quick way of checking out any suspicious registrations.