X11

I have installed the X11SDK and have tried to open the X11 app from /Applications/Utilities like MacOSX tells you but it is no where to be seen, can someone help?

You need to install X11 from your OS X install cd's. SDK stands for software devlopement kit and is no good without X11. (at least not the one for X11)
I think it's on the 3'rd CD.

See i have done this, I got a hardware test CD and then 2 install Cd's with my mac. I have installed the additional software on the cd and the Xcode tools and remembered to check the X11 box yet it does not seem to appear where it is supposed to.

OK, are we talking Panther or Jaguar? What version did of OS X did you install?
My Panther install came on 3 CD's and an Xcode cd. You might need to re-install X11. Look for a package called X11User.
Dont remember but I think X11 for Jag was a seperate download.

I am using Panther and i only got 2 install Cd's and the hardware test cd. The SDK is in /Applications/Intallers/XCodeTools/Packages. I dont have a package called X11User.

I ended up downloading it from the apple website and have it running now.

That's what I was going to suggest since you didn't have it on cd.
Do you know about Fink? Good place to get X11 apps.