This news account talks about an Australian telecommunications company that was hit by the infamous Slammer Worm. Slammer, which exploits a vulnerability in un-patched versions of Microsoft SQL Server 2000, was first detected almost two years ago. As always, don't forget to patch, and be very careful not to open old doors because “visitors” are still lurking around out there waiting to come in.
Take a look at this resource for helping to secure your SQL Server 2000 databases: SQL Server 2000 Security Tools
No excuses!