This extension glues windows together.
This simple organization tool puts all of your Chrome tabs together into one window with a single click.
The new window has your tabs arranged in the same order your windows were, and makes the selected tab in your current window be the new selected tab, so you won't lose track of where your tabs were or what you were doing.
It has an option to include minimized windows.
It works great with Tab Scissors (http://bit.ly/mh6E5L), which splits your window into two convenient side-by-side windows, so that you can rearrange your tabs in groups.
Version 1.2 Update: You can now also perform a glue or cut using a shortcut specified on the chrome extensions page. Default is Alt+S to cut, Alt+G to glue, Alt+A to glue all (including minimized windows)