You've got to be a little more skeptical, friends. Con artists work on your willlingness to believe, your kindness, your causes, and your greed. If you want to sign a petition, go to a petition site that can verify your identity. Email petitions are almost always hoaxes, and never work even if they are not - because the source of signatures cannot be verified. Such items reproduce exponentially when you do pass them on to your friends, and flood out works of activism that could make a difference. For liberal petition sites, click here. If you're a right-winger, search for your own links! ;-) You can simply search for the topic (i.e. "war on Iraq" +petition) on your favorite search engine.
Before you forward that virus alert, think about this. If you're supposed to "forward to everyone you know," if you see exclamation points and capital letters, if the source of the email is not McAfee or Norton or another authority on the matter, and if there is no link in the email to such a source that you could click on and check, it is very probably a hoax. Simply search for the name of the virus or the name of any part of the "chain letter" to check on its status (i.e., "free money virus" +hoax), or check at any of the links below.