Spam comments on blogs are becoming far more frequent and although filters like Akismet work very well, there are things that you can do to recognize spam and to deal with it, fighting back at the spammers and helping to warn others if they try to visit their sites.
Almost everyone who has a blog or web site these days, who writes articles or creates pages on sites like Squidoo etc, will be familiar with what is commonly called Link Spamming. For those of you who are unfamiliar, I am sure you have seen comments on articles that advertise shopping sites, where to get Viagra, get rich quick schemes or dating sites etc. These comments are almost always completely unrelated to the content of the original article, and the creators try to get backlinks to them by adding them to Guestbooks and Comment boxes wherever they can. This is Link Spam!