These sites are geared mainly toward the history of the Apple II.

Apple Computer, The Early Days (Paul Laughton) - http://www.laughton.com/Apple/Apple.html
A personal perspective from a programmer in the early days of the Apple.

Apple II History (Steven Weyhrich) - http://www.apple2history.org/
A very comprehensive online Apple II museum that tells the history of Apple II hardware and software. Lots of pictures and some song parodies.

Apple-History.Com (Glen Sanford) - http://www.apple-history.com/
An Apple history site that covers all Apple computers from the Apple I to the current Macs.

Apple II Text Files - http://www.textfiles.com/apple
A large collection of text files about the Apple II from the 80's & 90's. This site also has an archive of many Computist magazines at: http://computist.textfiles.com. There is a mirror of the site at http://www.apple2.org.za/mirrors/www.textfiles.com/apple/ (The mirror does not have the Comptist files.)

Beagle Bros Online Museum (Steven Franks) - http://www.panic.com/~stevenf/beagle/
A "tribute to the coolest software company of the 80's." A history of the company and product list, frequently asked questions, and much more.

DigiBarn Computer Museum - http://www.digibarn.com/
A virtual museum showcasing many early computers, including the Apple II. A PDF version of the Woz Wonderbook, a compilation of notes from Steve Wozniak's filing cabinet that served as the first documentation and technical support manual for the Apple II computer before the more famous "Red Book"is available for download here.

GUIdebook's Apple II User Interfaces - http://www.aresluna.org/guidebook/guis/apple2
The Graphical User Interface Gallery includes an article discussing the history of Apple II User Interfaces, as well as screen shots of MouseDesk/DeskTop and GS/OS.

Working At Apple (Rick Auricchio) - http://www.cfcl.com/rick/personal/apple.html
Rick recounts his time working on the Apple //e ROMS and shares some photos of an early //e prototype.

WOZ.org - http://www.woz.org/
The web site of Steve Wozniak, the inventor of the Apple computer.