Here's a product that's presumably designed with men in mind, for a change.
This ring, aptly named the "Remember Ring", incorporates a micro thermopile to heat up to about 49 degrees Celsius for exactly 10 seconds, 24 hours before your big day. It will also warm up every hour, on the hour, all day long literally searing the date into your memory.
The best part about this gadget - apart from never having to deal with your angry spouse for forgetting your anniversary or her birthday - is that it is completely maintenance-free. The thermopile uses the heat generated from your hand to recharge itself.