Privacy
I think that this could be a good product, if you are susceptible to certain genetic diseases then it can help you make changes that decrease the odds of getting the disease or reduce the impact if you do get it. Diabetes is a good example of a genetic disease that can be controlled by diet and excersize.
The downside of these tests is what happens if your health insurance company or even your employer gets this data. In one case, your insurance would shoot up and in the second case you may be unemployed or worse- unemployable.
If the gnetic testing results are discrete and only available to the person who ordered it, then it should be beneficial. It would also help if there were strong laws against an employer from forcing employees from divulging confidential medical information and also how insurance companies deal with that information.
I think that Yahoo is only adding a revenue stream and not inserting itself as the go between and data storage.
