I've just recently switched to Auctiva from using Turbo Lister. While I really like using Auctiva so far, there is one feature in Turbo that would be very useful to have here. They have a "Synchronize Listings" feature which allows a two-way communication between your active listings and your stored versions. If you make a revision, either in your stored listing or directly online, and then "synchronize", your changes are then immediately reflected to the other location.

I found it very useful in that if I just finished posting a lot of listings and am checking them in ebay, if I find a mistake I can correct it right online and have the stored version corrected too. That way, if you later repost the listing, you don't have to worry about catching the same mistake a second time.