Jott is a service that "converts your voice into emails, text messages, reminders, lists and appointments".  You just call a number with your phone (landline or mobile), speak your message, and it converts it to an email and sends where you want it to go.  They offer this service for free (they are still in beta) - no invite required.

What is amazing from a speech recognition perspective is that they can recognize an unconstrained vocabulary over the phone. Up until a short time ago, most phone-based speech recognition systems could only recognize a predefined combinations of certain key words (described in a grammar file) - think of speech-based IVR systems where you say: "tech support" to route you to a support representative.  Speech recognition using unconstrained grammars were limited to desktop based SR systems because of the size of language model that was required, and the amount of speech audio required to create a viable acoustic model.

Very impressive.

Other similar services include:

• Spinvox
• Twitterfone