Fruit Tree Information

General
http://www.nafex.org/ - The North American Fruit Explorers (NAFEX) is a network of individuals throughout the United States and Canada devoted to the discovery, cultivation and appreciation of superior varieties of fruits and nuts.
Avocado
http://www.hort.purdue.edu/newcrop/morton/avocado_ars.html - Great site with more than you need to know about Avocados.  Check the message board also if you are one of those gulf coast gardeners seeking a producing Avocado tree.
http://ucavo.ucr.edu/AvocadoWebSite%20folder/AvocadoWebSite/AvocadoVarieties/Hass_History.html - A Short History of the Hass Avocado
http://www.crfg.org/pubs/ff/avocado.html - More Avocado stuff
Citrus
http://citrus.forumup.org/ - Check it out
http://www.ultimatecitrus.com/ - UltimateCitrus.com is your portal to the world of citrus, the most complete index of links to web pages involving the Florida Citrus Industry and other citrus web sites around the world.
http://aggie-horticulture.tamu.edu/citrus/tamuhort.html - Texas A&M has some info to add as well.
http://aggie-horticulture.tamu.edu/extension/homefruit/citrus/citrus.html - Another TAMU article geared towards the home citrus gardener.
http://aggie-horticulture.tamu.edu/southerngarden/Figcitrus.html - Figs and Citrus for Texas Gardens
http://www.mayhaw.org/ - The Louisiana Mayhaw Association.
http://www.nafex.org/library.htm - North American Fruit Explorers.  Not Gulf Coast specific, but good info for those into fruit trees.
 
Grapes
http://www.plantanswers.com/grapes_in_texas.htm - History of grapes from the Texas Ag Extension
http://www.marylandwine.com/mgga/growing/glossary4.html - THE SUPER GIGANTIC Y2K WINEGRAPE GLOSSARY
Mayhaw
http://www.mayhaw.org/ - The Louisiana Mayhaw Association was incorporated in 1995 as a non-profit organization
 
Mulberry
http://www.crfg.org/pubs/ff/mulberry.html - Info from California Rare Fruit Growers