Ok, I decided to copy some of the pages I have bookmarked that I find particurlarly useful. Feel free to add your own. I hope to have this stickied at some future time.
Perseus Classics Collection
489 works of classical (Rome/Greece) litertature, philosophy, and history in Latin, Greek, and English.
Forum Romanum Corpus Scriptorum Latinorum
Massive site for Latin literature of all periods with many English translations, some onsite most offsite links.
Lacus Curtius
Photos of many Roman buildings and monuments, about 30 Roman texts (many not found on other sites), secondary sources (Smith's
Dictionary of Greek and Roman Antiquities is rather useful), and other resources.
Ancient,
Medieval, and
Modern History Sourcebooks.
Good selection of meaningful snippets and full texts from Ancient (3000 BC-300AD), Medieval(100AD-1600AD), and Modern(1400AD-Present) times. A large amount of dead links can make these sites slightly frustrating.
The Online Library of Liberty
Seemingly random selection of texts from all periods.
Internet Classics Archive
A selection of Roman and Greek authors, but this site is evil so please don't use it. The majority are incomplete texts, and most can be found elsewhere (except maybe Hippocrates'
On Hemorrhoids).
Project Gutenburg
The largest selection of texts to be found online. Although the majority are fiction or of little historical interest, this site still must be listed. If you can't find a text anywhere else, try PG.
The New Advent Catholic Encyclopedia
Not Catholic? Neither am I, but this site is a useful resource for all things Catholic.
Early Church Fathers
As it sounds, the writings of the early church fathers. Not a complete listing, but of good size.
Yale School of Law Avalon Project
As stated on the site this is a collection of documents in law, history, and diplomacy. It includes many documents and many that are not to be found on other sites. The focus is on the 18th Century thourgh the present.
American Rhetoric: Top 100 Speechs (of the last 100 years)
Transcripts and audio files of what the site considers the top 100 American speechs of the last 100 years.
University of Oklahoma College of Law Documents of American History
A selection of documents of American history including many speechs of the Presidents, this site is for when you don't want to browse through the massive Avalon Project page.
And that would all I have, for now.