If anyone is interested in doing this, I went with Airborrn Aviation Services out of Mariposa. They run one-hour "scenic flights", which are limited by NPS regulations (you can get as far as Yosemite Valley, but that's about it), and "aerial photography" flights that can go just about anywhere; I did the latter. These flights are $210/hour with a 2-hour minimum; additional passengers are $199 each. The pilot was great--very professional, and totally flexible.
Anyway, on to the photos...

El Capitan

Bridalveil Falls

Half Dome

Upper Yosemite Falls

Triple Peak Fork Cascade

Washburn Lake

Snow cornice, Sierra crest near Isberg Peak

Banner Peak

South Fork San Joaquin

North Fork San Joaquin drainage