A very useful tool from IBM, called SOMA ME, which help practioners on SOA engagements/projects, to create many artifacts like Service Model using SOMA. You can find an article on it at the IBM's System journal site here. Not to mention a famous quote: "A workman is known by his tools."
The Social Experience

Bharath Duggirala is part of Professional services group of IBM/Kenexa, based out of IBM Visakha Hills Lab in Visakhapatnam. He was earlier part of WebSphere development at IBM India Software Labs in Bangalore. Prior to this, he was a consultant at WebSphere BPM Practice. He is a Certified SOA Solution Designer(2007), Certified SOA Associate, co-author of WebSphere InterChange Server Migration Scenarios redbook. He is Member, Board of Studies, Dept of CSE, College of Engineering, Andhra University. He blogs here and tweets, sharing his Social Experience, as the scroll of Life unrolls in the Eternal Enterprise!