Hello everyone,
Thanks for your posts!
sparklinbluiz: Good question, right now Picnik does not have a feature that will allow you to edit or save batches of photos, unfortunately each image must be edited and saved individually. I will add the request for batch editing to our wish list!
Classieladiee: Picnik does not have a transparency feature or layer right now! Thanks for the request

lizlemon77: Another good question and request! Picnik does not have an advanced history attached to each photo at this time. Right now you can remove or re-add edits with the undo/redo buttons but you can not see the specific edits that have been added.
Thanks everyone! I hope this answers your questions!
Chelsea - Team Picnik