By Uche Ogbuji, IBM developerWorks
The world of XML and Web services is huge, and growing. developerWorks does much to map it out for you, but when you're looking for a schema or a public Web service to meet some pressing need, it's useful to have handy several key resources. This tip shows you how to comb through the enormous variety of Internet resources to find schemata and Web services using common search criteria. The best known source for finding public SOAP Web services is XMethods. It has a comprehensive list of SOAP services that you can sort by several criteria. It also provides a demo client so you can try out the services right from the index site. You can also keep track of the listings on XMethods programmatically using UDDI, RSS, and other means.sites that provide directories of Web services include RemoteMethods.com and Web Service List. A chronicle of interesting Web services is Web service of the Day.
One resource that straddles the Web services/Semantic Web is WSindex.org, a directory of Web services, XML, SOAP, UDDI, WSDL, and Semantic Web resources. This site is a hierarchical and searchable directory.
http://www-106.ibm.com/developerworks/xml/library/x-tiplkws.html