The interface makes it easy for users to create their own presence counter widget. It's really simple! I love being able to set my widgets up to count down when someone visits my site. For example, you could post your availability online for future dates. People could easily check out your profile before scheduling an appointment/meeting over phone/email. Sometimes we forget about our appointments/meetings until too late. So this would help us make sure everyone knows we're not available so no one gets surprised by something coming up later than expected.