What ever happened to the "Small Comet Theory" of water influx on present-day Earth?
The "small comets" buzz was temporary and has been completely superceded by subsequent evidence that it was all noise in the detectors.  A careful investigation that produced a null result looking for the comets is published in http://adsabs.harvard.edu/abs/2000JGR...10524907M.  The moral is, beware of the "1 sigma effect," where a researcher sees a hint of a signal and is beguiled into seeing it as something real.