I am trying to put my thoughts around SOA & Web 2.0 where certain boundaries are not crispy yet, mixing them with decent boundaries requires lot of harnessing on complementary features. While SOA embrassing richer architectural principles emphasising on Interoperability, Federation & Discovery, Governance, Reusability of Services etc – Web 2.0 taking a shape as a de-facto standard to change web-based user experiences. As these two well accepted Concepts in the current IT era, I would like to put on my thoughts around how these two are aligned?
 
  Are they complementing each other on any key features?
  Are they addressing any common challenges?

Here is a diagram that can be extended a lot – I tried to capture most minimal things of commanalities and differences.

   
 I feel right usage of Web 2.0 standards and SOA is really matters and makes lifes easy to understand if and only if there is a compelling need to leverage on the comman features that "SoaWeb" can offer. Simply trying to put everything together may or maynot fit 100% well to anyones requirements. But certain definite features of AJAX user experience in SOA based enterprise systems will be of great value as it gives a great face lifting to the current days GUI strategies that are going with enterprise systems.