kbdevents is a Linux kernel module that allows you to execute a command for every pressed key or to see its keycode. It includes some sample scripts that can be used as the command to be executed on every key pressed: a keylogger, a script to take screenshots in the console by pressing the PrtSc key, and another one that imitates typewriter sounds.
GD Star Rating is a WordPress plugin that allows you to set up rating and review system for posts, pages, and comments in your blog. You can set many options for displaying the rating stars, and also add widgets into the sidebars for displaying top ratings and other statistics generated by the plugin. The plugin includes advanced settings panels that will allow you to control many aspects of rating. The plugin also supports multiple ratings.