I never thought I'd see a request like this..
I brought one back with me from my trip to Oz in Jan. of this year.
I got the little booklet "didgeridoo, a beginners guide" with mine at it explains a few of the finer points of playing one.
One thing I found is the way you shape your mouth and where you put your tounge can make a pretty big difference in the tone.
If you hold your cheeks in tight, it will make a higher pitched
tone that if you let them puff out like Louis Armstrongs.
Vary the volume of air going through it to achieve resonance and it will sometimes get a harmonic going that sounds like the
whhooooweeeeeeeeoooooeeeee that you always hear.
Try playing it over a hard surface such as a tile floor or wood floor and vary the distance from the end to the floor.
You can also put the end into a big bowl or bucket to help give you some feedback on what different mouth shapes and tounge placement does to the sound.
Circular breathing is kind of tough to master, but with practice, you will find that you will be able to get sound out of the didge without as much air volume as when you first start out.
Also, try and find the best way the mouthpiece fits for optimum sealing, as this has an effect too. Mine has kind of a flat spot on one side, and I find that if I play it with the flat at the top, it doesn't take nearly as much "wind" to get sound, and the lip vibes that are the basis of getting the thing to make noise can be achieved with much less breath.
Is your's a bamboo or a eucalyptus limb ? The heavier ones are a bit harder to get to resonate becuse of the thicker walls.
Thus endith the didge lesson for today. Practice practic practice, thats what makes it easier to play. It also helps if your not driving those around you nuts while learning.
I used to have one living down the road when I lived in the country. Very handy for that sort of thing. 
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