Well, I dunno about Delete Doctor, but there's a real gem on Solway's Software Page (pointed at by the link above).
"MULTI-REMINDERS v2.2
A program to remind you of birthdays, bill payments, and appointments. Reminders can be periodic (eg, weekly, fortnightly, monthly, quarterly, yearly). And you can specify how many days notice to give you. Checks for reminders every time you startup your computer. .
This is neat, just runs and exits, so doesn't take up any resources. I've set up Task Scheduler to run it every 3 hours (I'm a forgetful procrastinator).