I am wondering how I go about making my controller work with other planes and heli's that I build.

Do I have to order a Seperate Transmitter for "Each Receiver"
or can I just have the Servo's and Receivers in each plane and change crystals.

What would be the best application to handle this. My controller can have up to 8 different models programmed into it. And I currently have 3 Heli's and 1/2 a plane (lol long story).

Thanks appreciate the help - I'm a newbie to the hobby! But watch me grow!

Just purchase receivers with a crystal that matches the frequency of the transmitter.

Where can a guy buy a couple Futaba receivers for number 55 frequency 72.890 ?

You can get them at your LHS (local hobby shop)
From Tower hobbies (distributor of Futaba in the USA)
From most mail order houses.
Or you can buy an "after market" reciever from one of the distributors such as FMA Direct.

EXCAP232

Go with Futaba Flight Packs, they have everything you'll need and are usually the best deal.

Servos
Receiver
Battery pack
Switch harness

Sounds good but which servo's ?

I have Enforcer ZR and Concept 60 heli's
and also the Lazy Tiger plane.

All my planes are on one frequency, so every time i buy a RX i get a crystal with it, means that most people i fly with know what frequency im on and dont get it for theirs so we can all fly together happy. no chance i'll have the wrong crystal in the wrong place either.