F-Secure reported today a new Skype worm today. It spreads via Skype Chat (text based). If you recieve a chat mesasge from contacts on Skype today with a hyperlink that appears to point to an image, often named dsc027.jpg do not click on it. (Unless your doing security research).
The link will attempt to download an executable called DSC027.SCR.
The SCR extension is usually used for screensavers, but the extension does not limit an application in any way. Try renaming an application to .SCR, it should still run fine.