Hudson adoption in the Eclipse community survey
Eclipse community did a survey on Java developers, asking various questions.
One of the questions they had was what build tool they use, and here you can see the adoption of various CI tools:
Among CI tools, Hudson is #1 with 128 votes, followed by Cruise Control with 67 votes. Bamboo is in the 3rd with 19 votes, and the rest is insignificant. So this is another validation that Hudson's adoption is going very strong.
(It's bit strange that they put Ant/Maven and Hudson/CruiseControl all in the same question, but I think we can still use this for the comparison among CI tools.)