Fluxbox is a window manager based on BlackBox with some new features:

 o Transparent menus
 o Pixmap themes
 o Window snapping
 o Integrated bbkeys
 o Iconbar
 o Configurable titlebar (slit)
 o Windows tabs
 o Wheel scroll changes workspace
 o KDE and partial Gnome support
 
WWW: http://fluxbox.org/