Basic links:

http://civilwarhome.com/gettysbu.htm

http://gburginfo.brinkster.net       (The Battle of Gettysburg Resource Center)

http://www.gettysburg.com 

http://www.militaryhistoryonline.com/gettysburg

http://www.nps.gov/gett       (The Gettysburg National Military Park)


July 1, 1863:

http://www.brotherswar.com/Gettysburg_Day_1.htm 


July 2, 1863:

http://www.brotherswar.com/Gettysburg_Day_2.htm

http://www.wheatfield.goellnitz.org/index.html 


July 3, 1863:

http://www.brotherswar.com/Gettysburg_Day_3.htm 


Artillery:

http://www.cwartillery.org/artillery.html      (The Civil War Artillery Page)

http://usregulars.com/artillery_main.htm 


Cavalry:

http://civilwarcavalry.com 

http://www.usregulars.com/Cooke.htm       (Cooke's Cavalry Tactics)

http://web.archive.org/web/20060206175917/www.bufordsboys.com       (General John Buford's Cavalry in the Gettysburg Campaign) 


Civilians:

http://www.jennie-wade-house.com/gettysburg-civilians.htm


http://www.shriverhouse.org 


Discussion Groups and Research: 

http://www.cwrtgettysburg.org         (Civil War Roundtable of Gettysburg)

http://www.gdg.org       (Gettysburg Discussion Group)

http://www.militaryhistoryonline.com/forums


Freemasons at the Battle of Gettysburg:

http://bessel.org/gettysbg.htm     

http://www.themasonictrowel.com/masonic_talk/stb/stbs/92-03.htm 



Lee's Retreat:

http://www.emmitsburg.net/montereypass       (NEW)



Monuments:

http://www.gettysburg.stonesentinels.com       (NEW)

http://www.virtualgettysburg.com/exhibit/monuments/index.html 


Photography:

http://www.brotherswar.com/Gettysburg-Panoramas-Day-1.htm

http://www.brotherswar.com/Gettysburg-Panoramas-Day-2.htm

http://www.brotherswar.com/Gettysburg-Panoramas-Day-3.htm  

http://civilwaralbum.com/gettysburg/index.htm 

http://www.usa-civil-war.com/Gettysburg/gettysburg.html#MAPS

http://users.snip.net/~hart/default.html       (Cassie & Tom's Gettysburg Photographs)


Preservation Organizations:

http://www.civilwar.org      (The Civil War Preservation Trust)

http://www.seminaryridge.org       (The Seminary Ridge Historic Preservation Foundation)


Research:

http://civilwarhome.com/strategyandtactics.htm

http://usregulars.com      (Infantry tactics)


Trivia:

http://www.funtrivia.com/quizzes/history/civil_war/gettysburg.html       (20 interesting and different trivia quizzes ranging from "Average" to "Impossible")


Other Topics:

http://gettysburgreenactment.com       (Annual Gettysburg Civil War Battle Reenactment)

http://gettysburgtourguides.org         (Association of Licensed Gettysburg Battlefield Guides)

http://home.ptd.net/~nikki/gburgcem.htm       (Listings of the soldiers buried in the Soldiers' National Cemetery)

http://pacivilwar.com/bates.html       (Pennsylvania Volunteer Regiments)       (NEW)

http://pareserves.com       (The Pennsylvania Reserve Volunteer Corps)       (NEW)

http://www.topogs.org/Engineers-1.htm       (The Union Army Corps of Engineers)       (NEW)