I ran across this site that makes cool changes to the Etsy interface for sellers.
It is for Firefox users only...I have found them useful.
* item zoom - adds a zoom icon to images in search and shop listings.
* edit this item - edit or delete a listing from the View Listing page.
* buyer info - add extra information to the "buyer" box on a receipt page.
* forum wrangler - add extra features to the Etsy forum pages.