Hello Working Group II,
A list of data centers supporting FDSN web services is now included on the FDSN web site here:
http://www.fdsn.org/webservices/datacenters/
There are sections for "Production" and "Prototype" services. The Prototype section allows for advertising your service end points with the caveat that they may not be completely ready.
If you would like to list your service end points on this page please write to the Working Group III mailing list <fdsn-wg3-products<at>iris.washington.edu>.
thanks,
Chad