Minimum Mana Required to Cast: 3
Blade Fury doesn't use up the durability of weapons, thus qualifies for ethereal weapons.
Blade Fury will attack constantly with 6 frames per attack. It does not work with Burst of Speed or any other increased (or decreased) attack speed.
Blade Fury is indeed dependant on your attack rating although that's not displayed. Check your chances of hitting a monster with a normal attack to determine your chance with Blade Fury.
Blade Fury does not work with piercing or Exploding Arrow effects.
Blade Fury works with effects on striking, but not on attack. Therefore, Curses and other effects can be triggered very fast.
The +min/max damage listed on the skill effectively works the same as +min/max damage added to your weapon on normal attacks, except that it is not reduced by the 3/4, 3/8 & 1/4 penalties. So for damage dealing purposes, on Blade Fury, you could treat it exactly the same as an off-weapon source of +min/max damage, ignoring the penalty. This is especially important, as with high levels of Blade skills, the +skill damage can deal more than the weapon "half" of the damage.