Check out WindowTabs: http://www.windowtabs.com/ [4]
Of course, if you were used to QtTabBar, an alpha version is now available for Windows 7:
http://qttabbar.wikidot.com/forum/t-101934/windows-7 [6]
Links:
[1] http://linux.philosweb.com/drupal/category/it/data-management
[2] http://linux.philosweb.com/drupal/category/it/software/software/os/microsoft
[3] http://linux.philosweb.com/drupal/category/it/tweaks
[4] http://www.windowtabs.com/
[5] http://www.youtube.com/watch?v=6dgQTleYxTg&rel=0&color1=0xd6d6d6&color2=0xf0f0f0&hl=en_US&feature=player_embedded&fs=1
[6] http://qttabbar.wikidot.com/forum/t-101934/windows-7