Today, I've set up cron jobs daily, at 01:05 AM GMT to send mail notfiying users with cron jobs nearly expired. First messages were sent at 12:17 GMT.
What to do when you have cron jobs nearly expired?
You can delete these cron jobs, and create new one. So, the cron jobs lifetime will be 1 month since created.
Or, you can upgrade your account, and get such benefits as cron jobs lifetime 1 year, or cron jobs every 5 minutes with only $5 for a year. It's cheap, isn't it? :D
EDITED: change execution time to 05:05 AM GMT.
EDITED: From July 18th, 2009, notifying messages will be sent when you have cron jobs expire on next x day, x=7, 5, 3, 2, 1.