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Brueso...including the Library of Congress site which also has a beautiful bunch of cards (although right now I don't know if they have T206s).
Also, folks here on the site directed me towards the book "Classic Baseball Cards: The Golden Years 1886-1956" by Frank Slocum which depicts the complete runs of the majority of the early sets (although no OBAKs)- I picked up a copy for $50 at half.com and it's well worth the $$ (out of print- originally sold for $79.99- check half.com and similar sites and you might find another copy).
Folks have been talking about another T206 book coming out soon?