How do I configure to use X windows apps like "ssh -X" or Tk?

I am trying to configure my machine as an X windows server so that I can use X programs remotely via "ssh -X" or run local Python scripts that use Tk. I'm currently unable to do this an am not sure what I'm doing wrong.
I have set my DISPLAY=".0". If I run xterm in a shell I get the following error:
$ xterm
xterm Xt error: Can't open display: .0
Similarly, if I run a simple Python script that tries to create a Tk app I get the following error:
$ ./tk.py
Traceback (most recent call last):
File "./tk.py", line 6, in ?
root = Tk()
File "/sw/lib/python2.4/lib-tk/Tkinter.py", line 1569, in _init_
self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: this isn't a Tk applicationcouldn't connect to display ".0"
If I try to run X-windows apps remotely via "ssh -X" it doesn't work (e.g. emacs still shows up in the terminal window).
What do I have to do to set this up?
Does anyone have a pointer to a detailed tutorial about setting the DISPLAY variable on UNIX. For example, one saying what the format of the value is. (You'd think this would be all over the internet, but I'm having a hard time Googling one up.)
Thanks.
MacBook Mac OS X (10.4.8)

"ssh -X" into a remote machine still
doesn't work though.
Because you need to use -Y (as someone already mentioned)
Please don't be upset at a blunt comment, but you can't get XDarwin without installing it.
However, you mention having fink. I would guess that you used fink to install something else that needed X Windows, and fink installed XDarwin for you. It would have asked you if you wanted to install dependencies and you would have said yes. If this is what happened, it happened because you hadn't first installed the X11 user package from your installation CD.
If it were my machine I would do the following: (1) remove any fink packages that require X windows, including XDarwin. (2) install X windows from the Apple CD. Install the X windows development package also. (3) reinstall the fink packages. fink should notice you have Apple's X Windows, and use it.
Then, when you start up Apple's X11 (which is in the Utilities folder, as someone else mentioned), you are starting up an X server, which is what you wanted in the first place. It will bring up a xterm window or two, as did XDarwin. In one of those use ssh -Y. Not -X. Use -Y. A while back, Apple upgraded to a more recent version of ssh, and everyone who had been using -X had to change to -Y.
You should not have to set DISPLAY. Not on the local machine, not on the remote machine. The ssh -Y command takes care of it for you on the remote machine. On the local machine it's already set for you when you start up X11. (Maybe if you run Terminal, and try to start X windows client apps from there you need to, but I never do it that way, so I can't say for sure. Some people prefer it that way.)
What's in Apple's X11 is essentially the same as what's in XDarwin. There may be some subtle differences, but I don't know what they are. The main thing is that it's confusing to have both installed.

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