You should be able to select multiple tabs to quickly organize them or close them.
It's a simple thing but it makes a lot of difference. To be able to multiple select and use ctrl and shift, it'd be very nice, a better UI.
This is a feature I really miss in TabCandy. And the opportunity to select multiple tabs by draging like you can select multiple icons on the windows desktop with the mouse.
Ethan Sisson commented
That functionality is already on its way to the tab strip for Firefox 4. Definitely needed for Tab Candy as well.
Agreed. Standard shortcuts of CTRL+click and SHIFT+click would be nice. In fact, I suggest adding that functionality to the tab bar as well, similar to the extension "Multiple Tab Handler" so that one might be able to send multiple tabs in the current group to a new/different group directly from the tab bar.
This could solve the problem of the cumbersome method of individually sorting unsorted tabs that exists right now, especially when they stack at the bottom.