This extension for the Google Chrome browser will add a button to the toolbar that once clicked will open a popup window that you can use to manage your windows and tabs.
Sometimes I have so many open tabs in one window that the tab titles shrink to an unreadable size. Because my Tab-Sidebar lists them vertically instead of horizontally (like the tab bar) you won't have this problem and can always read the whole title.
You can also create/remove tabs/separators/windows, make them active (doubleclick tab), resort them, and so on. To bring a window to front, just double click the window tab.
In addition you can mark important tabs by clicking the little heart icon in the tab list.
You can get it there: Tab-Sidebar at Google Chrome Webstore (free)