I second 0_equals_true's endorsment of fillable Makiwara striking bags.
I also like Makiwara boards:
I'm in the process of converting part of the first floor of my cabin into a small martial arts studio; there is a vertical support beam in part of the room that I've attached Makiwara punching boards to on two sides at three levels. Good for punching, kicking, elbowing, kneeing, and headbutting, and even work with escrima sticks; good for working on speed, form, and power, or just blowing off steam. Also good for toughening up hands, feet, and shins. Plus, I like the way hitting the boards on the beam makes the entire cabin shake, all the way up to the third floor (from what I'm told).
Good fortune,
- Icarus really does box with the dancing flies...
_________________
Please forgive me if, in the heat of battle, I sometimes forget which side I'm on.