I use my iPad to hang out in the forums, check my shop stats, respond to convos, update listings, renew listings, and other simple tasks.
There is probably a new app for uploading pictures to Etsy by now, but if not, you can't upload pictures. I don't have product pictures on my iPad anyway since I resize and edit my pictures on my computer. So, I don't list new items from my iPad.
I love my iPad and have had it since before starting on Etsy. It has a million uses.