Most bloggers probably realize the dangers of spam. Our blogs are constantly bombarded by spam, and even Akismet plugin is not able to stop all of it. That is why some bloggers came up with an idea of a spam fighting day. The idea is to conduct a rather interesting experiment by removing the Akismet filter from a blog for one day. All bloggers would be encouraged to join in and do the same. Later, all participants would be invited to share their results, comments, and observations. The purpose of such an experiment would be to focus the attention of spammers and bloggers on how much time, energy, and resources are being wasted on this futile spamming activity. If you like the idea of a spam fighting day, then why not organize it on your own, and gain respect of other bloggers in the blogosphere.
If you would like to limit the amount of spam your blog receives, then you may want to consider automatically marking comments as spam that have a link included in them. The main reason why spammers spam our blogs in that they want to receive backlinks. If we make it impossible for them to receive backlinks from our blogs, then they may not be interested in leaving that much spam.