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POPSJott Looks promising and works with Twitter as well.
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POPSAwesome Freebie: Jott Phone to Email Memo Service Jott is a free service. It has great functionality for bloggers, and can mobblog to anywhere. You dictate a message via your cell and Jott transcribes your messages and sends the text to your own email, another person's email, or a group of people’s e-mails. Studentl.inc has a how-to guide to set-up your Gmail account to automatically filter and label your messages so you can have a functional to-do list. Next time you're on the road and need to "Jott" yourself a message, or post to your blog, here's the way to do it!
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POPSJott - voice-based To-Do list Pretty amazing little online service. You call from your phone and leave a voice message. Then it appears in your e-mail not only as a voice file, but actually transcribed (and pretty accurately) so you can see the text as well. You can also jott other people. Very cool.