FYI
http://www.microstockdiaries.com/who-owns-who.html
Thats mighty outdated, by 7 years
interesting how things have changed.
updated things from that list
istock - still correct
StockXpert - no longer exists.. but JupiterImages was purchased by Getty.. so StockXpert is technically owned by Getty.
SnapVillage - closed down and ported over to Veer - still owned by Corbis
123rf - still correct
Shutterstock - still correct
Dreamstime - still correct
Fotolia - still correct but they have some big investors to answer to
CanStock - now owned by FotoSearch
Bigstock - now owned by Shutterstock
LuckyOliver - closed
Crestock - now owned by Masterfile