With WordPress 3.0 you get a new ‚default‘ theme called Twenty Ten. So upgrading to 3.0 will install this new theme to your themes folder.
This site is using a plugin to let visitors select themes to testrun, so give it a try and and have a look at this new theme. This link disabled will switch you to Twenty Ten Theme with the content of this WordPress installation.
Twenty ten has no image slider built in by default, but sure any slider like a jQuery cycle Slideshow or a Content Slider jQuery can be built in. search for ‚image slider‚ here
WordPress 3.0 gives the developers of Theme new APIs that allow them to easily implement custom backgrounds, headers, shortlinks, menus (no more file editing), post types, and taxonomies. Twenty Ten theme shows all of that off.