Now that's a n ice idea! Face2Face meetings are great and more "productive". I live in Athens, how about you guys?
Aγία Παρασκευή, δίπλα στo Noμισματoκoπείo 
Maybe I haven't done my full homework, but I can't seem to find any site or service to provide a cheap Web2SMS service (not bulk). Something like 3-5 cents per SMS. Is there? By the way, I wasn't thinking about contacting an existing service asking them to accept bitcoins. I was thinking about creating a whole new web service doing just that; send cheap SMS via a web page. The idea behind the project is to provide a useful service that accepts bitcoins to demonstrate (especially to Greeks) that bitcoin is not only about drugs (we only see negative articles on the Greek press about bitcoin >.< )
There are several such services already, with varying limitations. If you want to get competitive wholesale pricing from the source (mobile operators) you need to sing a contract for several hundred thousand SMS per year (that comes to thousands of EUR). Also, if you set up an anonymous SMS service with bitcoins, and your service happens to be used for harrassment, drug dealing, arms dealing or some other of the thousands of illegal activities, your account will be suspended by the operator, and you will be liable for your user's actions unless you give up their identification to the authorities. You need customer names and confirmed IDs to protect yourself from legal action. And that would make such a service much less attractive. Up to now, I've set up the interface and the user management back-end but I got stuck with Greek-character problems.
Maybe I can help with the latter. No promises, though.