.fay

This plugin allows you to add a sliding login/dashboard panel to any WordPress Theme. This awesome panel is based on http://web-kreation.com/index.php/tutorials/nice-clean-sliding-login-panel-built-with-jquery/
Instead of modifying directly theme files, just install this plugin so you can preserve you panel when switching between themes (or after themes updates).
You can also specify your own HTML content to put in the panel… Yes! this is awesome!

WP Sliding Login/Dashboard Panel

Excellent

Automatically add a sliding login/dashboard (or whatever HTML content) to your Wordpress Theme

cconoly

Social media floating fly out tabbed boxes. Can be located on either side of screen. FlyBoxes include Facebook, Twitter, Pinterest, LinkedIn, Google Plus, Youtube, Feedburner, Flickr, DeviantArt, Vimeo, Instagram, Tumblr, and Contact Me. 
Tab colors can be customized to match any theme. 
Since this uses CSS, some themes will affect the layout of the tabs. If yours is displaying incorrectly PLEASE let me know which theme is causing poblems and I will fix it as soon as I can. 
If you want a tab that’s not included then let me know and I’ll add it!

WP-FlyBox

Plugin is great,support is magnificent!



Great plugin and support!

Social floating fly out tabbed boxes/panels. Can be located on either side of screen and customized to match any theme's colors.

WP Sliding Login/Dashboard Panel vs WP-FlyBox