Chris of Web Service Finder writes:
When looking at the world of web 2.0 I think that you can categorize the companies and products into a few different areas:
Sites that create or originate content but do not share them openly are what I call data silos. Many of the “Web 1.0” companies fall into this area. Examples include: Match.com, Career Builder,
Web Service Providers :
Sites that expose functionality and data openly are what I call web service providers.
Examples: Google Maps, eBay API, Flickr
Data Silo Aggregator:
Sites that unify data from separate data silos into one common view.
Examples: AP News Wire (offline), Indeed.com, Oodle
Web Services Aggregators:
Sites that unify separate web services and/or data silos.
Examples: Chicago Crime Guy, Weatherbonk, Craigslist/Google maps mashup