Slider block which was released in the last month and is a very simple method to add slideshow in your Moodle course, has been updated to a new version 0.1.1 which is compatible for Moodle 2.9 also.
The block is a simple slideshow block with fade or slide effect. You can add up to 10 photos as slides, and configure parameters like slides interval, disable navigation or pagination, add header text or effect.
Slider is responsive, but You have to set up width and height in configuration to achieve correct display for your photos/images. Block uses SlidesJS jQuery based slider.
You can download the latest version of the slider block from the Moodle plugins database here.