Slideshow Options for WordPress NextGen Gallery

Smooth Gallery

(http://uninuni.com/wordpress-plugin-nextgen-smooth-gallery/)

Pros: Free,

Cons: None yet.

Photo Slide Show

(http://www.cozmoslabs.com/2010/01/13/wordpress-photo-slideshow/)

SlidePress aka SlideshowPro for WordPress

(http://slidepress.net/)

JW Image Rotator

(http://www.longtailvideo.com/players/jw-image-rotator/)