From Arizona originally, I like swimming but don't usually invite others into the shower with me. But here is a list of shampoos whose ingredients (though there are some specific exceptions in this list), purportedly do not include phthalates, sodium lauryl sulfate and/or parabens. Some claim to use only vegetable components. This list appears because the Yahoo Answers and other sites have little or misleading information posted. It shouldn't be this difficult, yet most of these products are not available from the big consumer online drugstores (drugstore.com, Walgreens, CVS, etc.).
The firms and products aren't necessarily recommended unless otherwise noted. Do the research.
Some have recommended GoodGuide.com. GoodGuide, still in "early beta," seems focused on the corporate citizenship of the supplier as much as the health or environmental consequences of ingredients.