ColdFusion Builder 2 is not officially out yet, but that hasn't stopped people like Brian Swartzfager from releasing cool extensions for it. This is partially because Adobe dramatically improved CFB Extensions in version 2.
Brian had built and released a CFQuickDocs CFB extension before, but it's now been updated, taking advantage of some of the new features in CFB 2. Check out his post to see all the details. I particularly like how it auto-detects your ColdFusion version (based on your project details) and then when you lookup docs it uses the appropriate CFQuickDocs doc library.