The proof is in the pudding.  Here's a message which was recently received on our Skype connection:

[1:32:29 PM] Online Notice ® says: WINDOWS REQUIRES IMMEDIATE ATTENTION
=============================

ATTENTION ! Security Center has detected
malware on your computer !

Affected Software:

Microsoft Windows Vista
Microsoft Windows XP
Microsoft Windows 2000
Microsoft Windows NT Server 4.0
Microsoft Windows Win98
Microsoft Windows Server 2003

Impact of Vulnerability: Remote Code Execution / Virus Infection /
Unexpected shutdowns

Recommendation: Users running vulnerable version should install a repair
utility immediately

Your system IS affected, download the patch from the address below !
Failure to do so may result in severe computer malfunction.

http://www.registryservice.org/?q=scan

Before you make this connection (which wants to launch a scan), do you know where it is coming from?

We do, this is the registry information for the Domain name registryservice.org:

Domain ID:D154029670-LROR
Domain Name:REGISTRYSERVICE.ORG
Created On:09-Sep-2008 10:41:20 UTC
Expiration Date:09-Sep-2009 10:41:20 UTC
Sponsoring Registrar:CSL Computer Service Langenbach GmbH d/b/a joker.com a German GmbH (R25-LROR)
Status:TRANSFER PROHIBITED
Registrant ID:CORG-227761
Registrant Name:Andrej KAZANSKI
Registrant Street1:159 Pod Nahorjem
Registrant Street2:
Registrant Street3:
Registrant City:PRAGUE
Registrant State/Province:--
Registrant Postal Code:44300
Registrant Country:CZ
Registrant Phone:+420.24976451
Registrant Phone Ext.:
Registrant FAX:
Registrant FAX Ext.:
Registrant Email:akazanski@europe.com

As you can see, this domain's own is in Prague, CZ.  Do you still want to connect to it?