It's included as a demo app, in qt4-doc

Does that help?

Otherwise, upon checking, I see other distros (Ubuntu, in particular) package
dbus-viewer into it's own subpackage.  Is that something you think may be desirable?

It may be desirable; it depends on how well the app works probably ;-) and 
whether it gets ongoing maintenance. it's certainly a useful app in principle, 
not just a demo. I haven't tried it though since I was too lazy to figure out 
how to build it, thus I was looking for the package ;-)

I'll try it out from qt4-doc and let you know.

Trying this out, I do think it's a useful app even in its current state. 

I guess before packaging it in /usr/bin you might want to ask upstream if they 
intend to take patches on it or otherwise what their maintenance plans are. But 
this is definitely a useful app for developers.

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