Cellphone towers are non-operational, land lines are completely down, no one can drop walkie talkies into the affected areas, the Gulf coast has been cut-off from the rest of the world.
Think about the impact of this on the stability of information in a digital age. If you wanted a listing of all the radio, television, and cell phone companies in New Orleans at the time of Katrina you might not be able to get it because websites that have compiled such lists, like "New Orleans Websites" at
http://neworleanswebsites.com or the "New Orleans Educational Telecommunications Consortium" at
http://www.noetc.org/, would be offline indefinately.
Fortunately, there are a number of print publications that UB owns that could help you answer these types of questions.
"Working Press of the Nation", Z6951 .W6, covers TV (including cable), Radio, and Newspapers in the United States. Listed by state, then city, it gives the companies address, website, established date, format (talk, religious, oldies, etc.), frequency/power, network affiliates, and management. All going back to 1999.
"Television and Cable Factbook", goes back to 1982. The "Cable Volumes (2)" cover cable companies by state and provides information on monthly fees, subscriber base, stations included in various service packages, address, and ownership. The "Station Volumes (2)" cover television stations by state then city and provides the address, email, website, power, antenna location and elevation, satellite stations, established date, and estimated households reached.