This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
If we mean the same thing by "webservice orchestration" -BPEL and similar approaches- then UDDI isn't required for those, either.
Actually, UDDI isn't used much for anything at all. The purpose for which it was built primarily -enabling a public market for web services- never materialized, making UDDI somewhat pointless. It is used internally in some large organizations, though.