Legal Recourse Against Spammers You May Know?

xrepete asks: "I have been getting spammed by a legitimate company for the last five months. I have gone to their site to ask to be removed, and sent several e-mails to various address asking to be removed from their mailing list. I have been totally ignored. We all get spam from individuals we can't identify, but what recourse do we have if we actually _can_ identify them. I've heard that it is illegal for a company to not allow you to opt-out of marketing spam, but I can find any information about how to go about it." This was last touched on over three years ago, but recent events have shown that the new spam laws may have better teeth. Are there other things we can do to curb the e-mail abuses of the companies we do business with?