I need to mody a servo so that instead of working with a reciever it will work with a momentary switch meaning:
I want to send a small amount of voltage into the unit and have it turn 90degrees, then whent he power is turned off i want it to go back to its neutral position.

How palusable is this? This is for a custom Robot project i am working on and a remote can't be used for this particular function.

You would need to create a PWM circuit to trigger the 90deg. movement.

So how do i do this?
And can i use a servo without using a reciever?

Google or hit some of the Robo sites.
There is lots of good info out there.

Can you recommend any specific ones? I have spent alot of time on google already and haven't found much

i know there are different ways of doing this but one way is to buy a microprocessing unit like the basic stamp 2 and put a program in it that makes it do what you want. for yours it would probally just be a loop with an if stament or two.
one nice thing about the basic stamp is it allows 16 lines of I/o so you could have 8 micro switches and 8 servos, if you wanted.
http://www.robotstore.com/catalog/display.asp?pid=475
http://www.robotstore.com/catalog/display.asp?pid=233

now this is some helpful information. I have heard of the stamp 2, but i never realy understood it. I'll start to read up on this stuff more.

thanks,
Any other advice?

they sell books on how to progam it but it is pretty easy you just plug in all your stuff and then you type the program into your computer. it uses basic which is probally the easyest lanugage to learn. and it works farily flawlessly