TwitterFone.com has been created by two friends of mine (Florian Sersoussi and David Marcus) in partnership with Twitter. It enables you to call with no extra charge a local phone number which is transcribed and posted to Twitter instantly (above an example of message). They just opened the service in Israel. I tested it and it works great. Twitter is becoming an interesting ecosystem generator for other companies.
ps: if you wish to have an invitation for TwitterFone just post a comment i have a few with me