Re: WordPress/BBPress Single Sign On
Remember that many users will already have the “remember me” set for their cookie on wordpress and that doesn’t expire for a year. This means their bbpress login will mysteriously fail. They’ll either give up or re-register a new nickname.
You also need the space and period plugin fix for names. WordPress allows them, bbpress doesn’t by default. So anyone with a space or period in their nickname will fail logging into bbPress. Not knowing such things can drive you mad.
I also went a step further and routed all the login links on bbpress back to the wordpress login box since it has a few extra features. I use the redirect_to option to bring them back to bbpress.
ps. another good integration thread for a future integration sub-forum