I too would like to have such a service available, having let my key expire again recently.
I've sometimes set up a local cron job to nudge me by checking the installed debian-keyring package, but that package doesn't always get updated (and I occasionally hear it's been talked of not including a package at all?). I kind of liked not having to have network access (other than normal package updating processes). Maybe I could run a cron job polling keyring.debian.org directly on some debian infrastructure instead (any suggestions where?)... but if I'm doing this for myself, others surely could use it too; a shared cron job that people could call to opt in to might be nice, and then they could control the email address to send and how often they want the reminders themselves... live well, vagrant
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