Wooslider is a really cool plugin introduced by Woothemes. It makes it really easy for website owners or administrators to add a image sliders to their websites. Wooslider comes with a variety of content layouts and slider types. It is very easy to customize, and with a little knowledge of  CSS you can make amazing slider types yourself. This plugin is recommended for every website owner to have, because it offers intuitive dashboard which makes life a lot easier for non-technical website owners who want to update their website slider. It is worth $29, this product can be found at woothemes.com