WP Carousel is a plugin that create a carousel with posts, categories, tags, authors, pages, customized content, external carousels and with the extras you can add any kind of content. You can put it anywhere on the blog, modifying your WordPress theme or adding the WP Carousel’s Widget to the Sidebar.
In the plugin’s options page you can add items to each carousel and there you can set up some options and the theme used in each carousel.
The plugin uses jQuery, StepCarousel, jCarousel and NivoSlider.
Please, before asking questions, read “Help” tab, there is a list of FAQ.
For developers, here is the documentation of WP Carousel 1.0.
You can see a demo here.