This is such a great article by Nathan Wallace that I rediscovered from my old list of favorites just now. A few highlights from the Manifesto for Collaboration Tools:

We are building processes and tools to help with collaboration, but should never forget that the main thing is that people actually work together and talk to one another. We don't need to capture every conversation or every piece of knowledge, we just want to strengthen weak ties.

Training in systems is important, but only after we've done everything possible to design for zero training. In an enterprise, your Mum really is the end user; design for her! Always sacrifice features and power for ease of use. The minute you have to train people you will lose them to the "more work" excuse.

It's tempting to aim for tools that deliver exactly what people need in different scenarios. To always take tools that one step further to capture their exact requirements. In reality, people like to push and abuse tools that are comfortable, flexible and part of their every day work (e.g. email, Excel). Wiki's, blogs and search are great examples of simple tools that can be used for a myriad of purposes without needing a million customisations or extensions.

Finally, deliver solutions that meet an existing need. If you build it, they won't come. But, you can build it around where they already are.

http://www.e-gineer.com/v2/blog/2007/12/building-enterprise-20-on-culture-10.htm