I have seen a lot of talk amoungst the internet and the television about the recent breakthrough in England where a person successfully cloned a human with a human seed and a bovine's egg (bovine DNA removed).  I understand that if successful the outcome would be a clone human with no animal DNA.

My Question is will we ever get the chance to mix DNA with humans and animals?  Will it ever become possible to alter my DNA so that I can get a tail or animal ears or the like?  Will the technology to alter an organisms genetics be reachable and, if so, how long will it be until so?