Z'ha'dum is an option on the ballot under 'Mythology and the Underworld' to name features of Pluto when the New Horizons spacecraft flies past. You can vote every day.
http://www.ourpluto.org/

ETA: I'd posted the link to JMS' Facebook page and he posted:
Which I admit I hadn't thought of. But the idea having Z'ha'dum out on the Rim of our solar system is still cool! 
Jan
http://www.ourpluto.org/

ETA: I'd posted the link to JMS' Facebook page and he posted:
Originally posted by Fans of J. Michael Straczynski

Jan
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