Research - Aviation Links
http://www.faa.gov for on-line data bases, publications and press releases.
http://www.aopa.org/asf/taxi for diagrams of 300 or so NOS airports in the U.S. For a non-duplicative site of diagrams of 100 or so towered airports, try http://www.jeppesen.com/onlinepubs/aptrelease.phtml
http://weatherimages.org/index.html for weather imaging of the U.S. This site contains links to other weather sites.
http://www.faa.gov/avr/index.cfm for access to Code of Federal Regulations [Aeronautics and Space], Airworthiness Directives, airmen qualifications, and the like.
http://registry.faa.gov/default.asp for a host of useful links to other aviation sites, airman records, aircraft certifications, pilot certifications, and the like.
http://www.ntsb.gov/Publictn/A_Acc1.htm for a list of preliminary accident reports - aviation - information for past 10 years.
http://aeroseek.com for a complete aviation search engine and directory with all manner of aviation supplies and information.
http://justaviation.com for links to FAA newsletter, current weather, file flight plans, purchase cool products, etc.
http://avitop.com is a site where you can put in the N# of any aircraft and get detail like make, model, serial number, date of registration, etc. This is a fully searchable site with a lot of information.
http://www.lycoming.textron.com is access to Lycoming's website.
http://www.aviationnow.com is Aviation Week & Space Technology magazine's home page. It has links to everything aviation.