i use weekly (4 x / day) pill box, with warfarin scheduled for 7:09 pm and baby aspirin scheduled for 9:30 pm, so that i can recheck if i took warfarin when i take baby aspirin.
In addition to the weekly pill box, i also use Medisafe iOS app (helps me find interactions across all the medications) and Pill Reminder iOS app. Pill reminder app keeps on reminding my every 30 minutes from 7:00 pm - 10:30 pm, till i let Pill reminder know that i took my warfarin.
I don't want to skip my warfarin, since my body processes it really fast and i usually have no residual warfarin left in my system if i miss warfarin for a day.
I also have an alarm 7:00 am to recheck my pill box that i took my warfarin night before.
I guess having additional checks and balances does not hurt.