There is an article in a British paper on how Jessica Ennis has signed a new endorsement deal with adidas for £320,000 which is close to $500,000 (1 £ = 1.56 dollars).
The Daily Mail article (http://www.dailymail.co.uk/sport/olympics/article-2069599/Rich-pickings-Jessica-Ennis-strikes-Gold-endorsement-deals.html) includes a chart of top earners as follows:
U Bolt - £5.1m Puma = $8.0 million
Liu Xiang - £3.2m Nike = $5.0 million
W Dix - £1m - £1.3m Nike = $2.0 million
Y Isinbayeva - £1.0 Li Ning = $1 million
O Pistorius - £1m Nike = $1.5 million
A Felix - £640,000 Nike = $1 million
T Gay - up to £640,000 adidas = $1 million
J Ennis - up to £320,000 adidas = $500,000
L Jones - £128,000 Asics = $200000
C Lemaitre - £96,000 Asics = $150,000
Clearly the list is missing some people in my mind (Asafa Powell, marathoners, etc) but it's pretty interesting.
Source is listed as Sports Marketing Frontiers (estimates).
List anyone else you know about below.