You don't need to clone a whole human being to do serious damage. You could synthesize the necessary chunks of someone's genome and use it to fake a bioassay. Imagine a disgruntled former lover using your genome to fake a paternity test—this kind of thing isn't very far away, and there are already services which let you upload a sequence and have DNA mailed to you.
The degree to which this is possible has been hugely exaggerated. Yes, you can have DNA mailed to you, but not DNA as its packaged in the human genome.
When you order from NEB or Sigma-Aldritch, what you get is a short DNA sequence (usually on the order of hundreds to thousands of basepairs) in a buffer solution. When forensic scientists do DNA preps of cellular samples from a crime scene or for a paternity test, they purify genomic DNA. This is millions of basepairs coiled around storage proteins to form a densely packed material called chromatin. The procedures used to purify chromosomal DNA would wash away any of the much smaller, synthesized fragments of the sort that you can order from a company, meaning that faking a paternity test in this manner is impossible.
Biotechnology is exciting, but not so exciting as University press offices might have us believe :(
Putting your genome online in this manner is more of a concern for insurance than anything else, I think— although as others have pointed out, discriminatory insurance practices based on preexisting conditions will soon be illegal in the U.S. . . . still, better not to take any chances.
Then wouldn't having a paper trail of your genome published on the internet provide reasonable doubt?
Plus, I can't imagine it would be too hard for a disgruntled former lover to get a DNA sequence done with an old toothbrush or comb. Not to mention you have the right to an independent paternity test.
