I recently added giveawayscout.com to my blog. This little widget is from the website, www.giveawayscout.com, where you will find that you can add your own giveaways to the newsfeed manually. You can have your giveaways automatically picked up by Giveaway Scout by including the term "giveaway" in your post title.
Giveaway Scout can easily increase the number of visitors to your website! I think I love it! I am going to be using this awsome (and free!) service on my blog permanently! Maybe I can get my reader volume up, and start hosting giveaways of my own!
You can add your blog here: http://www.giveawayscout.com/addblog/
Take the time to read through the site, and check out all the giveaways posted in their feed! Amazing!