Just came across this article on SOA Antipatterns at InfoQ. This is a very well written article. Steve used to be our Chief Architect a while ago before he moved on to join CapGemini.
InfoQ Blurb: SOA Expert Steve Jones from CapGemini provides a hands on look at SOA Antipatterns and a list of ways your SOA project can go wrong. This list includes signs that these problems are cropping up as well as what to do when you see them happening.
Check it out. It definitely gave me some food for thought.