e2 is short for Enterprise2.0.

Enterprise2.0 is the use of web2.0 tools in the corporate environment. So simply that means things like blogs and wiki's in organisations.

There have already been many examples of how using these often free tools have transformed the way companies work and share information. There's a great example where a German investment bank reduced it's email traffic by 70% just by using wiki's as a cornerstone of their knowledge sharing strategy.

We'll follow up with some more specific examples as we get going, but for now here are some definitions.

Wiki, Blog, Mash-up, web2.0