Heard this keyword from Ben in Java 2007 and found some interesting article.
Continuous Integration in Wiki
Continuous Integration (CI) 整合資訊 in MSFT blog Polo Lee
Introducing to CI in Java World
Actually, in xhc's project it may be worthy to give a try for project based CI and may be applied to each SKU. But we need lot of resource to verify fix and perform regression test.(scope/frequency are also big issue to apply CI)