Argh. Looked on the forum and came up empty handed on the subject of network rendering. Mental Ray's instructions seem pretty simple (though admittedly not very well written) and I have done everything "required" of me. My specs are:

Maya 2008 installed on primary system (Windows 7 x64)
RaySat installed on network system (Windows Vista x64)

Port identified as 7107 and firewall on router AND both computers opened up.

###.###.###: 7107 in .rayhosts

On batch render of simple frame w/ both master and network render enabled, looking at the mayaRenderLog.txt I only see my master system rendering out. Tested on complicated frame. Same results. Anything I missed?