In celebration of NetNewsWire 3.2 Beta gaining Google Reader Sync support, I created a quick theme that mimics the Google Reader "Expanded View" content area.
You should be able to double click the GR09.nnwstyle file and it will install into NNW.
if this doesn't work, copy/ move the GR09.nnwstyle file to the following directory:
~/Library/Application Support/NetNewsWire/StyleSheets/
After that, just select the "GR09" Theme from the drop down and you're good to go!
Theme does not affect combined view.