I know that in the Dell booth at MMS we've talked about the Dell Server Updates Catalog for SCCM 2007 for driver updates. I wanted to make sure everyone had a link!
You'll find both the Dell and Intel catalog here.
http://technet.microsoft.com/en-us/configmgr/bb892875.aspx
We'll be posting more detail on the Dell Server Updates Catalog soon - stay tuned!