I frequently see sellers on Etsy and other venues complaining about a lack of sales or a dip in their sales. Slow times happen due to just bad luck, the economy, as part of seasonal shopping patterns, or because the seller has become complacent. How you deal with this can have a big impact on your business. Here's a list of a few dos and don'ts for when business is slow:
DO step up your promotion efforts. There are plenty of ways to promote for free or cheap when you don't have the space cash for advertising in the form of blogging, twitter, other social networking sites, squidoo, directories, participating in a giveaway or contest, etc.
DON'T sit constantly refreshing your stats or obsessing about them. Stats are useful but checking them constantly is not productive. No more than once a day.
DO work on new ideas. A new product line or variation can perk things up if people get excited about them. Besides when things do get busy you aren't going to have as much time to work on these things. The last time you want to be working on a new product type is the middle of the holiday shopping season.
DON'T look for a scapegoat. By this I mean don't look for something outside your control to blame your lack of sales on. It may exist, the economy isn't too hot right now, but you can't change some things. Focus on the factors you can control.
DO some homework. Take some time to take a class, read a book, etc. on running a small business. Your local small business association is a good reasource for this.
DON'T be afraid to ask for help. Many sellers are willing to give you some help, Etsy has a whole team full of them http://etsymentors.blogspot.com/