Since Sunday night the spam and phishing email traffic related to Osama Bin Laden has increased tremendously. And that's not just the only place OBL related scams are showing up. There have been malicious Facebook postings, fake YouTube videos and many other fake/scam social network related postings to lure people into clicking the links and infecting their computers.
You can find more information at this Barracuda Labs blog post. And even more at this Computer World article.
Overall - be skeptical of even TRUSTED friends sending you anything OBL related at this point because it is hard to pick out the real ones from the fake ones. Please use trusted news websites such as CNN, BBC World News, ABC, NBC, CBS, Yahoo News, Google News and others to get your information.