This eWeek article seems like common sense but it’s surprising how many are ignored to the peril of the project:

A growing number of companies are implementing SOA projects to lower IT integration costs, while improving the time it takes to make changes to business units. However, according to Paul Callahan, manager of technical services at NetManage, of those companies that have begun deployment, many are held up in the early implementation phase.

I thought 2,3,5 and 6 we particularly relevant/notable.