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I’ve written a small extension for mercurial called ‘config’.  It allows you to view and set configuration values for hg from the command-line.
Some example commands and output:
prompt> hg showconfigs
! /usr/etc/mercurial/hgrc
* /etc/mercurial/hgrc
* /etc/mercurial/hgrc.d/hgext.rc (ro)
* /etc/mercurial/hgrc.d/mergetools.rc (ro)
* /home/jdoe/.hgrc
* /home/jdoe/projects/hgconfig/.hg/hgrc
prompt> hg config –verbose ui.username
values found for ui.username:
jdoe@host C:\Documents and Settings\jdoe\mercurial.ini
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