Just about every web developer must now be comfortable at least consuming APIs, if not creating them. This trend now shows itself in job titles including "API" and "mashup," and more often in the requirements and experience section of job listings.
Quick: Name that professional network with more than 50 million members. Did you guess... Viadeo? LinkedIn is larger, with over 175 million members. But Viadeo has upped it is game with its acquisition of Pealk, which bills itself as the #1 head hunting App on the web. According to the press release, that search ability is what Viadeo is after.
The SOAP-based Field Nation API allows your app to do a range of activities possible on the site, from finding technicians to monitoring work in progress. Field Nation covers a wide range of areas of expertise, from health care to computers to helping individuals install home entertainment systems.