I do love Craftopolis aligned with Google Analytics: shop and items views, hearts, purchases per day/month, tags, editing, etc. Gorgeous!
http://craftopolis.comCraftcult's Vault and Heartomatic are wonderful. They tell you what Treasuries made it to the FP, when you've been featured on the FP, in Etsy blog and newsletters.
http://craftcult.com/Shmetsy has released a FANTASTIC extension that allows you to send convos to all 16 shops featured in a Treasury in just one click. It's a huge time saver!
http://shmetsy.com/I'm going to give a try to Uncle Gravy's Renewing Agent, too.