Welcome to the Grip Club!
I got the BG-E3 Battery Grip for my 350D, equipped with 2 batteries in it.
Makes the camera feel and look more substancial, with the added weight and size. I actually just took it off today, and I find it more awkward to hold even in landscape since the bottom of my hand kind of comes just below the batter bit (with out the grip) so with the grip on the bottom of my hand is still on the camera.
Like David said, once you get it do a review, since I bet there are a few D40(x) owners or owners to be that would appreciate it
Good luck with your purchase!
Canon EOS 5DmkII + BG-E6 + Canon EOS 40D + BG-E2N + Canon EOS 33
Canon 17-40 F/4L
USM + Canon 24-70 F/2.8L
USM + Canon 28mm F/1.8 USM + Canon 70-200 F/2.8L
USM IS + Canon 85mm F/1.8 USM
Canon Speedlite 580EX II + Canon Speedlite 540EZ + 2 x Nikon SB-80DX
Cactus V2s Wireless Trigger - 5 x
Cactus V2s Wireless Reciever