The DiggDigg plug-in is adding about 450pixels to the bottom of my webpage when I view it in Safari. I've tried activating/deactivating just the floating slider, just the normal slider, all, it'll still happen as long as the plug-in is active. I've also tried with two different themes (Aggregate from ElegantThemes and Twenty Ten) and it's happening in both of them.
Other than that it works perfectly, runs 100% in Firefox & Chrome.
I noticed that this bug is true on other sites using the plugin: http://www.sitesketch101.com/15-incredible-wordpress-plugins-you-need/