Here you go, pics and profiles from the Fly Past Special of July 1999, and some from Roger Freeman, along with the list of A/C from Freeman's 'B17 at War'. You'll notice that the relatively short history shows a high attrition rate, both from enemy action and accidents. Two things worthy of note; one of the losses was caused by a Bf109T, and the first U.S. fatal casualty of the ETO occured in 90 Squadron.
The surviving aircraft went to 220, Coastal Command Squadron, ending their working lives as trainers.
It's generally regarded that 90 Squadron, although perhaps not contributing massively to the bombing campaign with the early B17's, certainly acted as a 'research and development' unit for the (then) mysteries of high-altitude operations.