I happened upon this site from another site I frequently visit and mentioned here in the past.  Lost Souls Genealogy Project is a place where you can talk about your research ups and downs, find links to information that may be helpful and is beginning to build databases of information for genealogists.

I particularly like their new and growing links to maps in the US and the US timeline.  They also have a nice selection of links that could lead you to breaking through that brick wall.