bbPress.org

Let me repeat and clarify – it’s IMPOSSIBLE to integrate bbPress 0.9.x with WordPress 2.6 – the cookie methods are now completely different. You must use 2.5.1

Sam has hinted at the possibility of doing an early 1.0 alpha release which would be compatible with WordPress 2.6 and WPMU 2.6 – no promises and no mention of a specific date yet.