Luiza Pagliari and I, Paulo Caroli, gave a talk on the history of Continuous Integration (CI) and CruiseControl at the 2010 FISL conference (International Free Software Forum).
We talked to Martin Fowler and other colleagues at Thoughtworks and to gather (and validate) data on CI and CruiSeControl history. Below is short presentation with this data.
Please contact me if you are interested in the CI history topic and blog about it. I will add your links to this blog post.