Yes, both Rainforest Cafes (at Animal Kingdom and Downtown Disney) take priority seatings....and in my experience, you definitely want one in order to eat there or the waits can be 1+ hours.
You can also join the Safari Club which will costs $15, you get priority seating and discounts. when I joined I recieved a $10 voucher which I was able to use the next day. Membership details have changed so check their website. You also recieve vouchers for your Birthday and anniversary and they normally don't bother about when the coupons expire. If you enjoy dining there it well worth it! :
thewave: