Okay, since everyone has been helpful I feel like I must come clean about one really dumb mistake I made. The reason I couldn't find x11vnc in xterm was simply because I didn't really understand how to change directories. I was working under the (wrong) assumption that if I was in root (/) I could cd to /usr, and then once in /usr I could simply enter "cd /bin", expecting that to drop me into cd/usr/bin.

Now I realize that was totally wrong. Of course telling xterm to cd /bin, it's going to change the directory to /bin. I'm sure there must be a way to cd [current dir]/[desired dir] without having to enter the full path. I just don't know what it is yet.

So yes, x11vnc is in /usr/bin, just as Benson said it would be in the post I referenced earlier.

Also, I'd like to apologize about the confusion regarding my desired goals. Indeed I started this thread explicitly stating that I wanted to figure out how to VNC from the nokia client to the XP server. However, as I began to understand how this works, I thought that I might as well figure out how to VNC in both directions. Everyone has been so helpful, I'm sorry if I've been obtuse about what I'm trying to do.

From best I can tell, if I can figure out how to set up an SSH and VNC from my nokia client to my XP server (my primary interest), then I should be able to figure out how to do it from an XP client to the nokia server. I'm just interested in learning as much about accessing my network as possible.

So when I was setting up the SSH before, I was doing so as so:

ssh -L5901:localhost:5900 [name]@[XP.server's.actual.IP]

Now according to this:
It appears that my VNC session (nokia client to XP server) was not going through the SSH. Is this correct? In order to send the VNC through the SSH, I need to specify the an IP of 127.0.0.1:1?

OK, from my limited knowledge, I know that 127.0.0.1 refers to the local address. Soooo. . .I'm guessing that the :01 part of 127.0.0.1:01 somehow tells VNC to go to the other end of the SSH tunnel. Does this sound right? For example:

ssh -L5901:localhost:5900 [user]@[local.IP.address]:0

Is this correct? Do I add :0 because the other end of the tunnel is defined as :5900? Would I add :1 to the localhost if I defined it as :5901?

OK, that's enough questions for now. If I ask too many in one post, I can't keep all the answers straight.

Thanks for the help. You guys rock.