The linked version here is 1.4b1 (which is far more stable than 1.3) Haven't hit any bugs with it yet in Leopard 10.5.7.
An elegant little Menu Item.
Would like to see Kevin Wojniak add a preference to auto unmount selected volumes at boot option. This would make it indispensable.
Semulov
quickly unmount drives & volumes from the menu bar
Version: 1.3