With all the troubles there are with IVF in the first place, I’m surprised Britain wants to open another can of worms with this:
Britain is considering whether to approve a fertility treatment designed to prevent some incurable inherited diseases under which babies would be conceived from three biological parents.
Health Minister Andrew Lansley asked the Human Fertilisation and Embryology Authority (HFEA) to assess three-parent in vitro fertilisation (IVF) after British researchers said they had mastered the technique using cloning technology.
Also, didn’t Dolly the sheep die remarkably early?
by 
Another chance to play God. Good. If scientists wern’t willing to play God, we’d still have a life expectency of forty.
Also, regarding Dolly… yes. Dolly had issues with accelerated ageing due to telomer e damage, a consequence of being cloned from an already-old cell line. Embryos modified using this proposed technique would use nuclear DNA from a recently fertilised zygote. Sexual reproduction resets the clock, so the issue of accelerated ageing would be avoided.
“If scientists wern’t willing to play God, we’d still have a life expectency of forty.”
Untrue. Although some unethical means have been used (eg. the use of fetal cell lines to develop and produce vaccines) we could certainly have achieved the same ends using ethical means.