Although I don't agree with this model, we're taking my boss's job and turning it into a DBA position. We'll have five people directly in IT:
A domain sysadmin (main servers, e-mail, security)
A Siebel sysadmin (supports siebel-specific servers)
A DBA (manages actual database activity)
A Siebel support specialist (Will handle all end-user support related to Siebel itself)
A desktop support specialist (me - everything else workstation-related)
We'll all report directly to my boss's boss, who is insanely busy already. I think that's a recipe for an extremely disorganized and chaotic IT department.