Wikipedia: Battle of Kursk. If you don't know, Wikipedia is an "open source" encyclopedia. Anyone can edit it, any time. Surprisingly, it works; but caution is still in orderfools and vandals can have their say too. For this article as elsewhere the real strength of Wikipedia is the massive hyperlinking.
"Analysis of the battle of Kursk" by Benjamin R. Simms, Armor (March-April, 2003). Lengthy article describes the conditions, narrates the battle, and analyses it from the perspecture of a U.S. Army Field Manual's nine principles of war.
The Battle of Kusk from the Soviet Perspective, on the Voice of Russia (State Radio). This is a detailed, multi-part narrative of the battle, translated from the Russian version, part of the larger site The Road to Victory 1941-1945. I can't tell if the text is Soviet-era or Russian; the photographs and much of the text are lifted from Soviet-era books, but the Kursk narrative may not be. Whether new, old or a mix, the assesment of Kursk's significance is not revisionist.
"The Battle of Kursk" by Ralph Zuljan. Poor.
Alan Wilson's Kursk site. This one's a little hard to get a handle on. It's a sprawling, impressive, collection of resources both reproduced and created specially for the site, that is also disorganized, unfinished, and apparently not updated for some years. Once can only hope that Mr. Wilson will return and kick the site into shape; it has the potential to be the most important Kursk site on the net. Some highlights include an excellent collection of Maps, many produced by Wilson, a section on German and Soviet Orders of Battle and on The Battle in the Air.
Brief history by Valeriy Potapov, from a Soviet source.
"At the Kursk battle Germans lost almost twice as many men in a week as Americans lost in the three years of the Vietnam War."From Russian Battlefield, a wonderful collection of resources on the Great Patriotic War.
Reader's Companion to Military History: Battle of Kursk entry by Williamson Murray. The RCMH is an excellent handy resource, but this isn't the best entry, repeating the canard that the Invasion of Sicily was involved in Hitler's decision to halt the operation.
Moscow News pocket history. Decent.
World War Two Multimedia Database Kursk entry by Jason McDonald