What about this:-

http://www.sqlservercentral.com/articles/Editorial/65140/

Steve makes reference to "his beloved SQLServerCentral Friday shirts"

I agree...

http://msdn.microsoft.com/en-us/library/ms365937.aspx

does indeed make for interesting reading regarding system db's

Shazbuts!!!

I also went for types but could only think of 3 off the top of my head... (Bad DBA, no donuts for you)

Clustered, Non Clustered & XML.

...Hangs head in shame!

Are you by any chance using local/localhost as your server

I had a similar problem on a development server while migrating a SQL 2000 database to SQL 2005.

The original DTS was...