[Trent Adams]

It will be fine. From WordPress 2.0.4 to WP 2.2 there were no changes in the wp_users and wp_usermeta tables that would give you an issue using bbPress that I am aware of. I guess the easiest thing to do would be to install bbPress in a directory off WP and see how you make out following all the integration instructions. You can always move folders later by just changing the config.php to have the address that you eventually would like.

Trent