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You can read more about the open source VNC remote control program here. Running the VNC server on a Redhat desktop is currently not as simple as installing the RPM.

Problem #1:
I can run the vnc server but all of the fonts in X apps look like boxes and strange characters.

Solution:
Set the font path in the vncserver executable to point to the xfs font serverrunning on tcp port 7100 by default in your system.
1. Install the vnc RPM:
vnc-3.3.6-2.i386.rpm

2. Become root and edit /usr/bin/vncserver
3. Go to this spot in the file:

# Add font path and color database stuff here, e.g.:
#
# $cmd .= " -fp /usr/lib/X11/fonts/misc/,/usr/lib/X11/fonts/75dpi/";

4. Add this line:
$cmd .= " -fp unix/:7100";

5. Kill any existing vnc servers using the "vncserver -kill :N" where N is the desktop number, and restart it to see the results.

Problem #2:
I want to run panel, but it complains that this is not a Gnome-compliant window manager. How do I change the window manager to something that is Gnome compliant?

Solution:
Your user directory has a .vnc directory in it. That .vnc directory holds an xstartup file.
Edit ~/.vnc/xstartup and comment out this line:
twm &
and add these lines:
icewm &
panel &