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.
Ping & DNS - updated with new look and Ping home screen widget