I like Snapfish. The problem with Winkflash is that the quality of the prints kind of sucks. They have tons of promotions where you can get free prints, but personally, if the quality sucks then it's not worth it even if it's free. I use Snapfish for that reason. They ship quickly and are pretty reasonable. I made a photobook on Snapfish from a vacation I took last year and it turned out really well.
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