hi
one main impact of the Information technology in Human Resource Management is HRIS - HR Information System. This system had penetrated almost all the desks of HR People. One more growth in the HR with respect to IT is in Recruitment like online recruiting, online assessment, online HR Counselling
there are also various advanced growth in this field like Balanced scorecard software, software for assessing people etc.
Hope i answered your question to an extent. Let the discussion go on...
with regards
jayavel.k