I have downloaded a historical USGS map that is suppose to be a geoPDF. My understanding is that QGIS cannot directly read geoPDF's. I have not had any luck in converting it to a geoTIF in order to bring into QGIS.
Has anyone had any success in doing this? Is there another way that someone knows to use the geoPDF with QGIS.
I converted the geoPDF to a TIF and attempted to use the georeferencer plug-in. Everytime I try doing it te results are not correct.
Answer
You are right that QGIS can not (yet) read GeoPDF, but GDAL 1.10.0 can do it.
Assuming you are on Windows, you can download the current version from
http://www.gisinternals.com/sdk/.
GDALwarp can transform your GeoPDF into geoTiff:
gdalwarp -of Gtiff NY_Newburg_144216_1903_62500_geo.pdf Newburg.tif
Make a batch file with that content, start the SDKshell.bat, then run the converter batch. The output can be read by QGIS without the need to georeference: 
(With a little help by underlaying Openstreetmap from the Openlayers plugin)
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