perhaps it's de rigeur to mention this in a thread about genetic tests, but if you've had it done already by one of the major providers, the service mentioned in this piece (promethease) is really fantastic.

if you're lucky it won't tell you much you don't know, but learning about all the possible things to look out for (heightened risk of diabetes and adverse reactions to a medication, for me), sorted by magnitude, is exactly the kind of thing you'd hope to learn from personal genotyping. it's much more granular than what is offered by eg 23andme's health service, and is updated with new research. it's more than worth the $5.