I went to Startup Riot in Atlanta this week and one of the more interesting startups was a company called ShoutNow — a rapid voice messaging company. The idea is that you record a short message using your own phone, then ShoutNow broadcasts that message simultaneously to a list of numbes you enter into their website.

The uses they suggest are more personal — coach notifying the youth soccer team that practice is canceled, pastor notifying the congregation in emergencies, etc. But a really good use of this technology for entrepreneurs is creating a voice reminder for registered attendees for your event.

You can’t be too proactive in making sure people remember to attend an event for which they’ve registered, and most people won’t mind a short voice message if it’s something they really don’t want to miss. Email is good, but it’s not reliable for time-sensitive events.

You could also use this as a follow-up reminder after the event to encourage people to get in touch if they have questions. You don’t want to bug people, but I can see a number of ways this could be used effectively to reach people who can’t reliably be reached online.