You do not say what version of bidi package you use? If you use a recent version of bidi package, you should have no problem with tikz and subfigure packages. You also do not say exactly what is the problem? I am now the maintainer of subfig package, so any problem with subfig package can be reported to me.
-- Best wishes, Vafa Khalighi
-------------------------------------------------- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
