...depends really on how serious it is - if the information is as precious as an Iraqi uranium depository then you should absolutely not attempt to recover anything and get the pros in.
If however, you don't have the time, money or inclination to got to such extremes then data rescue seems fine - it shows all the files available and whether they can be recovered or not.
Never used it to save the day, but looks like the business. If you haven't altered anything, it should pick it out.