Here is the list of web sites where you can find information about some of the Chapters on the list:

Chapter Lists:
Keith Houston

Spellbook

Other sites:
The Colossal 40K Resource

Portent

Realm of Inisfail

Scythes of the Emperor

DakkaDakka

Kaptain Gavrin's

One Thousand Legions

Simon's Warhammer 40k Page

The Warhammer Web

Millenium 41

GW Gateway 2000

Flames of Knowledge