Whether your congressman reads your letter doesn't really have a lot to do with the practicalities of the problem, unfortunately. Legislation to punish those responsible severely is desirable, and in many jurisdictions already implemented (its a problem with big financial consequences, as you can see from the scale of it, which I touch on, below). The problem though is one requiring technical solutions
There have been periods in recent months where
over 95% of all global email traffic has been spam (yes, you
did read that correctly, and my figures
are accurate!) Most of this is filtered out at the service-provider level, and its only the stuff that gets through
those filters that customers (that is, us) see.
Spambots signing up to forums - and using forum facilities to spam, to advertise, and to attempt to raise search-engine rankings - is an increasing problem too. That's what CAPTCHA
http://en.wikipedia.org/wiki/Captcha is all about - trying to prevent them from registering. Unfortunately, the spambot software is getting better at solving (or circumventing) this sort of problem.
There are other sorts of tests that can be used at registration - for example questions which require knowledge to answer, where such knowledge would be expected of genuine users.
There are websites compiling blacklists of spam IP addresses, and associated information, but lengthy IP-block lists are not ideal - however, see for example:
http://www.spamhaus.org/sbl/http://www.honeynet.org/http://www.projecthoneypot.org/As Earnest said, its an arms-race. At the moment, the best strategies on forums seem to be trying to prevent them from registering in the first place, or promptly turfing out those which are spotted.
Dave