Following is a summary of principles that Yellowikis demonstrated. Be sure to check out the whole series for full details: Part 1 - Introduction; Part 2 - Industry Disruption and The Competition; Part 3 - Demonstrating Web 2.0 Principles.

Principles of Web 2.0 applied by Yellowikis

• Web-based (of course) and uses wiki technology; the same MediaWiki software that powers Wikipedia.
• Any user can both read and write content - adding business listings and editing them. To put it in 'Web 2.0 wanker' terms, it harnesses collective intelligence.
• Requires a significant amount of 'trust' in the users.
• Can be deployed via the Web in countries all over the world (see Emily Chang's interview with Paul Youlten for more details on this aspect).
• Developed and is maintained by a small team (just Paul and his 14-year old daughter - both working part-time).
• Has fast, lightweight and inexpensive development cycles.
• Uses Open Source LAMP technologies (Linux, Apache, MySQL and PHP) - meaning it is very cheap to run.
• The content has no copyright and is freely licensed under the GNU Free Documentation License 1.2.
• Can and will hook into other Web systems, e.g. Google Maps. Indeed if it introduces its own APIs, then it will be able to be remixed by other developers.
• Relies on word-of-mouth and other 'viral' marketing.
• Requires network effects to kick in order to be successful (at least at the scale of disrupting the Yellow Pages industry).
• Yellowikis will get better the more people use it. The Wikipedia is an excellent example of this.

[Full story on ZDNet...]

I intend to do more of these Web 2.0 Case Studies, it's been enjoyable and I've learnt a lot!