Next Post Fly Box for WordPress is a lightweight WordPress plugin that creates floating boxes with the next/ previous blog post.

Features List

Display Next And Previous Floating Box,
Support For Custom Post Types And Post Categories,
Extensive Admin Area Based On Ajax With Multiple Options,
Sorting Posts Settings: By Selected Field And Direction,
Box Content Settings: Featured Image, Title, Excerpt And Close Button,
Dimensions Settings: Box Position, Box Width, Featured Image Size,
Animations Settings: Method And Speed, Easing Type (Separately For The Opening / Closing Actions),
Display Settings Box In Selected Categories And Posts,
Separate Plugin Options For Next And Previous Box,
jQuery Powered,
Documentation Included.