When you obtain conditional residence status, the USCIS will notify you of the conditional basis of your status, the requirements for removal of the conditions and what will happen if you fail to file a petition to remove the conditions. You will not get any other reminder when it is time to actually file the petition to remove the conditions on your "Green Card".
Please take the free questionnaire at http://www.immigrationdirect.com/gre
encard/Form_I-751_Remove_Conditions_Residence_Greencard.jsp to check if you qualify.
http://www.immigrationdirect.com/greencard/Form_I-751_Remove_Conditions_Residence_Greencard.jsp