LitCommerce eBay Etsy Amazon +

This has been the easiest and most complete app I've tried for pushing my products to eBay. The template and recipe features help automate a lot. All apps like this have a learning curve but after two days I feel like I have my head wrapped around it and most of my ~1,000 products are listed. I've dealt with two people for support so far and both have been professional and very helpful in helping me get setup.

UPDATE: A couple years later I can still give this 5 stars. Their support is phenomenal, the product is very stable and the features are very complete.