Thomas Schulte

This plugin dynamically shows preview screenshots of hyperlinks as tooltips on your WordPress site.
For the tooltip effect a jQuery plugin called “qTip2” is used internally. 
Find more about this great project here: http://qtip2.com/ 
The thumbnails are provided by http://thumbsniper.com and its API.

ThumbSniper

This plugin dynamically shows preview screenshots of hyperlinks as tooltips on your WordPress site.

Pigi

Use this plugin to Remove WordPress 3.1 Admin Toolbar

Admin Toolbar Remover

Use this plugin to Remove Wordpress 3.1 Admin Toolbar

ThumbSniper vs Admin Toolbar Remover