I've recently been involved in putting together a blog series on developing an Identity Management roadmap. It's a 3 part series over at the Identropy blog. Part 3 is a bit long for my taste, but has a lot of great content I'm sure you'll benefit from if you are involved in identity management strategy development for an organization.
Part 1 is an intro to what an identity management roadmap is, who needs one, who doesn't and why.
Part 2 is about the prerequisites to developing a roadmap.
Part 3 is the meat & potatoes of how to develop one.
We've left some room for input and discussion. Chime in!