If you are a new beta customer, you must either create a new login, or add beta access privileges to your existing login. For ColdFusion 4.5.1 Release Candidate 1 or ColdFusion Studio 4.5.1, go to http://www.allaire.com/bart. For HomeSite 4.5.1, visit http://beta.allaire.com/homer.
ColdFusion 4.5.1 Release Notes
ColdFusion 4.5.1 Documentation
HomeSite 4.5.1 Beta 2 Release Notes
ColdFusion Studio 4.5.1 Beta 2 Release Notes
Allaire has set up the following methods for giving feedback/getting help on any problems, questions or issues that may come up in the Beta process: