A. On a single page with one picture:

http://msmvps.com/blogs/bradley/archive/2008/10/18/dynamic-dns-service-on-sbs-2008-under-the-hood.aspx

-- or --

B. In three parts with lots of pictures:

Part I:

http://blogs.technet.com/b/sbs/archive/2008/10/17/introducing-the-internet-address-management-wizard-part-1-of-3.aspx

Part II:

http://blogs.technet.com/b/sbs/archive/2008/10/17/introducing-the-internet-address-management-wizard-part-2-of-3.aspx

Part III:

http://blogs.technet.com/b/sbs/archive/2008/10/17/introducing-the-internet-address-management-wizard-part-3-of-3.aspx