Spoilers ahoy, since I did a lot before finally beating the game!
Allied with the NCR
Recruited ED-E and Raul but did not complete their companion quests
Protected Goodsprings from the Powder Gangers and killed Eddie at NCRCF
Blew up Vault 19 (which, due to a bug, produces the same ending slide as if I'd completed "Why Can't We Be Friends?" I'll kill Cooke next time.)
Completed "Flags of Our Foul-Ups" by training Mags' squad at Camp Golf
Drove the Followers out of the Mormon Fort
The Kings maintained their independence in Freeside and did not join with the NCR
Great Khans went to Wyoming
Killed Tabitha at Black Mountain
Completed Volare! and got Boomer aid at the Dam.
Destroyed the Mojave Brotherhood
Killed the Fiends for the NCR commander at McCarran and killed Motor-Runner in Vault 3.
Novac retained its independence
Primm under NCR control with NCR sheriff bringing law and order
Courier given the Golden Branch by the NCR.
Allied with the NCR
Recruited ED-E and Raul but did not complete their companion quests
Protected Goodsprings from the Powder Gangers and killed Eddie at NCRCF
Blew up Vault 19 (which, due to a bug, produces the same ending slide as if I'd completed "Why Can't We Be Friends?" I'll kill Cooke next time.)
Completed "Flags of Our Foul-Ups" by training Mags' squad at Camp Golf
Drove the Followers out of the Mormon Fort
The Kings maintained their independence in Freeside and did not join with the NCR
Great Khans went to Wyoming
Killed Tabitha at Black Mountain
Completed Volare! and got Boomer aid at the Dam.
Destroyed the Mojave Brotherhood
Killed the Fiends for the NCR commander at McCarran and killed Motor-Runner in Vault 3.
Novac retained its independence
Primm under NCR control with NCR sheriff bringing law and order
Courier given the Golden Branch by the NCR.