Summary: One of my long-time coworkers, Edward Bell, has published a TechNet Radio podcast on how Microsoft IT's datacenter SMS team built their business case for using System Center Configuration Manager.
It's true that it's inevitable that all Microsoft SMS infrastructures will be upgraded to ConfigMgr (and the desktop infrastructures were upgraded long ago), but due diligence still requires a business case. That may help you in building your business case. The following links provide the details:
MP3 hi bandwidth
MP3 low bandwidth
p.s. Some of you may have noticed I haven't blogged for awhile. Ok, a long while. You're right, and I don't have a good excuse. Yes, I've been busy - a ton more client health work, a lot of content distribution work (which is big in itself), and recently power management. And I had other stuff going on, like a trip to India, enjoying the summer, entertaining over the holidays, and building my media room (which is a lot more involved that I was expecting, but truly awesome):