We've been looking for a long time for a well designed monthly pill organiser and are delighted to have found this one from MedCenter.
The MedCenter system has 31 boxes, with each box having four compartments: morning, noon, evening and night. At the beginning of each month you fill each box with pills and stand them up with the green number facing upwards. Each day you take your tablets and then turn the box round so the red number is facing upwards.
The system can also be combined with the talking pill reminder.