.NET Sample Web Services
Includes some ready to use sample Web Services. By Microsoft.

Web Service Searching from within Visual Studio .NET
This site allows for the ability to browse to a web service from within visual studio .NET using the 'Add Web Reference' menu option. You can then immediately add it straight into a .NET application.

.NET XML Web Services Repository
Samples, links, and a repository of web services developed using .NET.

TerraService
The Microsoft TerraServer .NET Web Service is designed to simplify the task of accessing TerraServer programmatically.

Geocode.Service
The code and data to implement Geocoding web services: translation from a physical location (lat/long, OSGB, UTM) to postcodes, cities and countries and back again. The initial implementation is .NET version providing a SOAP entry point. [BSD License]

LearnXmlws.com
Web Services resources, including books, presentations and links. Indigo (a set of .NET technologies for building and running connected systems) team member blogs.

MSDN Web Services Developer Center
Microsoft WebServices development resources.

GotDotNet Resource Center - Web Services
A collection of information about Microsofts .NET Web Services.

MetriWorks
Delivers software that enables the detailed measurement and analysis of .Net web service usage patterns.