I like auto post schedules. It is very easy to reach people in social media. I also like Sale Event Manager. It saves time for creating promotion to items. Favathons are fun and make more traffic to my shop.
I really like the fact that there is so much information here. I have really learned a lot about how to market my Etsy site. The sale I have going is really helping my sales and my brand name is being recognized. The hourly postings to FB, Pinterest and Twitter are such a time saver for me. You also have great "help". The person I talked to answered all of my questions perfectly and even gave me more "tips" on how to promote my site.