By the way, beyond just sending voice reminders to yourself - which is pretty valuable itself - you can "Jott" events to your Google Calendar, or Jott tasks to your "Remember the Milk" or Toodledo To Do lists, among others, or 30 Calendars, Backpack, etc., etc. You can also send SMS messages with Jott. The recipient(s) can either read the test recognition or listen to a .wav file of your voice message itself.
A lot of really cool uses!
EDIT: Almost forgot -- you can also send a Jott voice message to Amazon.com naming a product - any product they might sell - and Amazon will then send you search results with descriptions and prices to your cell phone. It includes links so if you see a result you want you can click it and purchase it right then, as long as you have an account at Amazon!