By purest coincidence this was mentioned on a tv show here yesterday. The mamoth was a small example of one of the systems in trying to clone dinosaurs. Hmmm!
Anyway apparently as DNA is so frgile it seemed to be unlikely, however in reovering a fossil leg bone it was found to be too heavy to remove from the site in one piece, and was carefully broken into pieces to get it back to base.
The pieces were then taken to a university lab to reassemble. Using electron microscopes they found small pieces of fossil matter and cleaned them up, by the process of cleaning a l;ab assistant noticed that the fossilised tissue became pliable.
Further tests were done on other bones in a museum with the same results. Again under electron microscope it was found that the bones contained small organic cells that were too small to become fossilised but were and are used to build bone tissue.
It has not gone much further as far as I know, but if the tissue is still pliable they seem to think that DNA may be obtainable in microscopic quantities. If this is so, artificial means can increase the amount of DNA.
The surmising is along the lines of if there is enough produced, it may be possible to clone a dinosaur of some description.
Personally I am dubious about this, but you never know until it is actually attempted.
Using this "supply" of DNA and devolving 'suitable' birds they said they may be able to clone something in the not too distant future.
Well thats what they said anyway.