It's an interesting experiment, because aside the Jurassic Park angle, because there could be some interesting results from gene function experiments from extinct species.

 

http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0002240

It is a start. What makes Thylacine (Tasmanian Tiger) different to other preserved tissue is that a chunk was preserved in ethanol, instead of the more commonly used formalin. Formalin destroys DNA while ethanol preserves it. This permits DNA reactivation.

Very interesting and contemporary research. However, at the end of the day, we still have gene banks of short DNA sequences from extinct species. I cannot see there being enough intact DNA to restore dinosaur samples, for example. In this case it was a short enhancer sequence.

 

However, is there a possibility of extracting enough mammoth DNA to restore mammoths by somatic cell nuclear transfer using elephant ova?