USGS has an amazing amount of high resolution imagery available.  Sometimes access outside of The National Map, can be confusing--what tiles are in my area, etc. (I encourage you to check out the National Map for a more integrated view). 

I have figured out what orthos are available from USGS along the Gulf Coast (LA, MS, AL) and created access points via ArcGIS layers and Google Earth Network Links.

To access color USGS Orthos (color and B/W) from gisdata.usgs.gov for the disaster area in Google Earth use the following network link:

www.mapdex.org/GE_KML_LINK.cfm?servername=gisdata.usgs.gov&mapservice=USGS_EDC_Ortho_DOQQ&layer_id=DOQQ_208,DOQQ_209,DOQQ_210,DOQQ_227,DOQQ_228,DOQQ_229,DOQQ_246,DOQQ_227_BW,DOQQ_228_BW,DOQQ_245_BW

To access the same data in ArcGIS download the following layer file and add it to ArcGIS:

http://www.mapdex.org/data/USGS_EDC_Ortho_DOQQ.lyr


Please note the scale dependacies in these services.  They will not turn on for large areas (limited to under 1:3million scale).

Jeremy