I use my Google Calendar for everything, school dates, bills, and Sweepstakes Entries! I'm reminded to enter the Allure giveaways, get my vote in for the survivor player of the week before the deadline, or to get my free Chocolate on Friday mornings at 9am from https://secure.realchocolate.com/
I just checked my Calendar and saw this --- for anyone who entered the 1st round of the Amazon Magazine cover voting contest, the 2nd round is up now. Vote for one magazine cover as your favorite and get an additional entry for $10,000 Amazon Gift Card
Find what works for you - Google Calendar, date book, or just your regular calendar. A little organization is a good thing.