Be very wary of emails you did not expect to get and of any web pages they may link to. Just because an email or web page looks nice or is interesting or you are just plain curious is no reason to start clicking away.
A case in point is the recent malware that pretends to be about President Obama (or for you Irish folks, O'Bama). The Microsoft Malware Protection Center (MMPC) blog has more about this Waledac Trojan, including pictures of an email and the malicious web page.
Remember, it's perfectly OK to be paranoid -- the bad guys really out to get you!