Sometimes I need to leave two or three folders open at the same time, this is where the tab features comes into help, and I do not need to open two or three instances of Windows Explorer.
Briefly tried the QTTabBar 1.5 (Alpha 3) in Win7. Works basically ok, but found that the "Favorites" on the left pane can't be locked successfully in the tab bar when you re-open the Explorer. That said c:/users/*username*/links can be locked well. Both are actually pointing to the same folder containing shortcuts in Win7.