A recent batch of malware has been targeted at users of the Skype VOIP phone service. Apparently the malware made use of a No-IP hostname (nsdf.no-ip.biz). No-IP received notification of this early on the 18th and promptly disabled the account and DNS host of the user that developed the malware. All logs related to this users account have been preserved and will be handed over to law enforcement for prosecution. More information regarding this Skype virus can be read at The Register and over at F-Secure and Symantec.
Please note that you should never click on suspicious links or run executables (.exe files) from unknown sources. Also, please be sure to update your virus scanning software frequently and run it often.