I know it's not a gadget, exactly, but I have found Word Press, and LOVE IT!
It's a blog tool & web publishing platform. I have found it easy to get started, and in just a couple of days, I have a working e-commerce site, which I have paid very little for. (I registered my domain at www.godaddy.com
, then got my brother to host the domain for me - he has a business doing web hosting), and he helped me install wordpress, and off I went! They have plug ins to use to customize your site with anything you can think of - I've got a "share this" button, a shopping cart with Paypal, a registration form, and much more up and going in just a couple of days!