Yes
Till now you would enter an aquaitance's mobile number at http://www.freetext.com/
Now you can get a reply back via Email - by entering your email id .
How it works is that we check if the target number is assigned to any email id - if it is not then we assign it yours. Later if we receive a text reply from that same number then we send that message to you. This is valid for 3 days. After 3 days someone else can use the same number. Of course if you send a SMS from the site to the number then this is refreshed - your email will receive replies for 3 days from the last message sent.
Sample message received page : http://sel2in.com/prjs/php/p5/drupal/d1/sel2in/o1/m/sms_dfJKSDFsel2in.php