Web Sites as DLLs

Here’s a quick analogy: In Web 2.0, web sites are like DLLs.

Each web site provides a library of functions for manipulating data. The simpler ones (the vast majority) serve semantic markup in the form of RSS/Atom. The more complex ones serve semantic markup in the form of Rest or Soap.

Participants either write DLLs or write applications that use them. Some, but not many, do both.

Use those DLLs (web sites) that make your application better. Ignore those DLLs that don’t.

What combination of DLLs will become the killer application?