Honestly, I think the certifications for webmasters in general are a little outdated and not so widely used anymore. If anything, a solid portfolio and experience will get you more clients or a steady job in the field above a certification. While the CIW is a pretty widely advertised program on the internet, you might try looking at a university - I know Florida State University offers one, and it's all done online. Many offer certifications that don't take a long time and are just as affordable as the CIW.