Question: I was wondering if anyone knows of a free WMS of imagery that I could use within QGIS. The imagery does not have to be high resolution (Blue Marble even). I would like to have a base imagery feed from a WMS.

Any help would be appreciated.

Thanks...

Answer: 
You didn't specify which topic your WMS Feed should cover, but have a look a the website [mapmatters.org](http://www.mapmatters.org/).
They have a very extensive database with WMS servers connections that you can query.

Also the Openlayers plugin provides nice background images from Google Maps, Bing & Co.
You may use the USGS WMS:

Here are the links for their aerial 1ft and 1m service (note, sometimes they are down):

[The National Map - Service Endpoints](http://viewer.nationalmap.gov/example/services/serviceList.html) 

**\* USGS 1 foot imagery -** <http://raster.nationalmap.gov/arcgis/services/Orthoimagery/USGS_EROS_Ortho_1Foot/ImageServer/WMSServer?request=GetCapabilities&service=WMS>

**\* USGS 1 meter imagery -** <http://raster.nationalmap.gov/arcgis/services/Orthoimagery/USGS_EROS_Ortho_NAIP/ImageServer/WMSServer?request=GetCapabilities&service=WMS>