This ability comes in handy occasionally (rarely) for me, but I just use Verizon's email-to-SMS service and procmail. What would get me to switch to this, though, would be if you offered a command-line of sorts that lets me control it by sending it SMS messages. For example, let me tell it to start forwarding or ignoring emails that match certain rules.
Cool, but how is this different than <a href="http://teleflip.com?">http://teleflip.com?</a><p>Also, it's been possible to send text messages to your phone for a while, see: <a href="http://lifehacker.com/software/cell-phones/send-sms-from-email-127033.php">http://lifehacker.com/software/cell-phones/send-sms-from-email-127033.php</a>
btw it only works for cell phones in the US.
and on popular carriers...
(using the email-to-sms interface the carriers provide -- for example if you send an email to PHONENUMBER@tmomail.net, then a sms message will be delivered to PHONENUMBER) see the lifehacker link that sam odio provides above.
if someone wants to work with me on this, email me (sri at defcraft dot org). work to take this public (right now it won't handle a massive load) -- it is build with ruby on rails and python, so if you have productions experience with rails -- that'll be helpful.<p>