PingMe is an interesting free service that sends you alerts and reminders via email to a desktop computer or SMS text message to a mobile phone. While there are many other providers offering such a service, what’s unique about PingMe is that you can reply to the pings via email or SMS text messages to reschedule or turn off the reminders. For example, if you get a reminder from PingMe at 12PM and you want to be reminded in another 30 minutes or 2 days, you can simply reply to the ping by writing:

30mins

2 days

Here’s a complete list of supported intervals:

seconds: [ s, sec, secs, second, seconds ]
minutes: [ m, min, mins, minute, minutes ]
hours: [ h, hr, hrs, hour, hours ]
days: [ d, ds, day, days ]
weeks: [ w, wk, week, weeks ]
months: [ M, mo, mos, month, months ]
years: [ y, yr, yrs, year, years ]