In his book titled Loosely Coupled, Doug Kaye has offered a checklist for developing a strategy for web services. After going through it, I found it useful as a starting point for making road-map for SOA adoption. This checklist has got more than 80 items grouped into into four categories: Inventory, Project Requirements, Planning and Evangelism. You can find this checklist as a free chapter download (without giving out email address!) from the book web site.