Hello Everyone.. I'm Owner of http://themehunter.net and i want to install Newsletter widget in my WordPress Theme. I don't have any idea where i can get widget like webdesignerdepot.com's widget Because i like webdesignerdepot's Newsletter widget very much.
Then why don't you ask webdesignerdepot what they're using, and whether it's a plugin or coded specifically for their site?
All you need to do is create the signup form with your autoresponder. I use Aweber and can create a form like that in a few minutes, then in wordpress add a text widget to your sidebar where you want the form and paste the code from your autorespnder. al