Some interesting websites that I stumbled across that help promote your handmade store and generally just make it easier for you to gain some exposure. Some of them charge a small fee, but are very reasonable.
Lovely Clusters - international site that gathers handmade and vintage items from sellers all over the world together for people to browse through. Each item is linked to the sellers shop. Starting from US$5 a month you can have some of your items featured there (after you have submitted your shop website and it has been approved).
Indie Art and Design - a weblog featuring products made by independent Australian artists, designers & craftspeople. You can submit your site to be part of their art and design directory.
We Love Indie - describes themselves as "a unique platform for indie artists, crafters and designers to showcase their best work and to allow these works to be discovered by a new audience". Sounds good to me! Basically gathers heaps of art, craft and design blogs together on one site for people to browse through. If you have a blog for your work you can submit it to be part of the site.
Indiespotting - a website that features handmade products that people have discovered and submitted to the site. Each item is linked back to the seller's store. You can submit an item from your store to be featured and its free!
I Heart Handmade - an online handmade market. Each shop participant has their own page on the site with up to 10 product images linked directly to your online store. They charge about US$20 but they put heaps of work into marketing and advertising the market and they also do shop spotlights on the site and their blog.
That's all for now but I'll post more as I find them!