WP-PageNavi: Adds a more advanced paging navigation your WordPress blog.
Installation Instruction:

Open wp-content/plugins Folder
Put:
Folder: wp-pagenavi
Activate WP-PageNavi Plugin
Refer To Usage For Further Instructions

Download
Random Redirect: Allows you to create a link to yourblog.example.com/?random which will redirect someone to a random post on your blog, in a StumbleUpon-like fashion. You can also specific in the URL random_post_type or [...]