We take spam seriously, our office and all staff use Spamcop to report spammers.
This is very effective, we have seen hundreds of spammers removed from the internet in the past few years just by simply forwarding the email to Spamcop then clicking the link provided to alert the spammers hosts.

Sign up with Spamcop here http://www.spamcop.net/anonsignup.shtml
They will send an email to the address you enter, with your own spam address to use. You must then "Forward" the spam mail to the address Spamcop sent you, Spamcop will return your spam as links (second paragraph down) to send spam reports, click each link then scroll down the resulting web page to "submit reports"
Be sure that your website or email address is NOT checked as spammers will often disguise links using your details. That's it :)

If you pay Spamcop (very cheap) you will be helping to keep the service running, and reporting your own spam is much easier as a member.

More Anti-spam links