Socialtext customer Angel.com has put together a SOAP API based solution to create their Wiki Knowledge Base and, very much in the vein of Open Source, have made their code and approach public on Socialtext's Customer Exchange wiki.
This is a great validation of the power of Open Source, and Socialtext's approach against insular data. We believe any information should be easily moved into (and out of) a Wiki, and SOAP and REST are some of our strongest allies in that pursuit.