Jeff Poskanzer's site has the ACME Mapper -- good satellite mapping facilities. Lots of other goodies at the home site, too.
This was released on Jan. 14 -- sorry I'm so late. CERT has issued this advisory discussing vulnerabilities in H.323 implementations. H.323 is a standard multimedia telephony protocol which most have probably experienced with Microsoft's NetMeeting. It says exploitation of the vulnerabilities could result in arbitrary code execution, denial of service or reboots.