I found a new place where you can list your giveaways. Its called Giveaway Scout. Giveaway Scout is a giveaway search engine. Their users subscribe to receive updates on the latest giveaways on the web. Add your blog and your giveaways will be exposed to their large network of users. Check out their box to the right , you can display it on your blog so you can view their list of giveaways as well!!
I'm going to check this out.