The DMC has released a production version of a ws-traveltime service.
This version (as compared to the Beta version released last week)
contains minor changes related to output formatting and is based on the
recently released Version 2.1 of the TauP Toolkit package from USC.
(More information on the TauP toolkit can be found at http://www.seis.sc.edu/TauP/)
Standard IRIS documentation with example queries, the URL Builder, and
even the actual service can all be accessed from the following link: http://www.iris.edu/ws/traveltime/