Although web services are predominantly being used in the business world, I definitely agree with Michael Bazeley that they could (via business2blog) have a huge impact on the way individuals present themselves on the web in the broadest sense. Besides the entrepreneurial opportunities this creates (I'm working on one), it will also force relative newcomers like eBay and Monster to rethink their business model.
"An XML feed for anyone who wants one. This puts Monster in a new position. It puts eBay in the buyer insurance business, or something other than the listings themselves. It's exactly why web services exist. Taken further, the concept would allow people on both sides of the transaction (buyers and sellers, recruiters and job-seekers) to publish ads. A smart search engine would automatically notify them when it finds the right matches (think Semantic Web )."