reminder service php script

Hi, A while back there was a discussion of a good reminder service script, I need one now, have searched at hot scripts but because there are so many scripts there its a bit confusing... am still searching there but if any of you remember it, remind me please :-) ( in case you're confused, reminder scripts basically work like this: you make an account, enter some dates you want to be reminded on (eg pals b'day) and 1 or two days before you get an email reminding you) Cheers, -Ryan