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Uploading seems to be the buggiest part of the beta. Although it will tell you in advance that selected files are too large--stated policy is 10MB or less per image--it doesn't tell you that it won't accept any image with any dimension of 4,000 pixels or larger until after it's tried and failed through an entire upload queue. Unfortunately, that size cap filters out 12-megapixel photos, which are no longer the province of just dSLRs: popular snapshot models like the Canon PowerShot SD950 IS, Kodak EasyShare V1253, and Sony Cyber-shot DSC-W200 will all be disqualified.
Photo credit: Lori Grunin