I’ve been using Jott now for a few weeks and it’s super useful. You set up a (free) account, give it your e-mail address and phone number, and (optionally) any other friends e-mail addresses who you may want to Jott. Once set up, you just dial Jott (a toll-free 866 number) and the automated system asks who you want to Jott and what your message is. You can Jott “myself” or any friends name that you already set up on the web site. A few minutes later, the recipient gets an e-mail with a text transcription of your message. The voice to text translation works really well in my experience.
I use this all the time driving to or from work – anything I’m trying to remember, especially to do lists – I just Jott them and then I have a nice list waiting in my inbox when I get there. Highly recommended.