[CentOS] CentOS 3 fails yum update

Here's what I get: 

[root at socrates root]# yum update
Gathering header information file(s) from server(s)
Server: CentOS-3 - Addons
Server: CentOS-3 - Base
Server: CentOS-3 - Extras
Server: CentOS-3 - Updates
Finding updated packages
Downloading needed headers
 Resolving dependencies
.IOError - # 2 - No such file or directory

I've tried yum clean and yum clean all, rpm --rebuilddb. 

Any ideas? 

-Ben 
-- 
"The best way to predict the future is to invent it."
- XEROX PARC slogan, circa 1978