I'll give you the blurb from the website:
The fact is that unless you are on a contract that doesn't always suit you, you end up spending up to 12p for every time you send a text message. Haven't you ever thought this was a problem?
We used to think about this all the time. Then one day, we came up with i-text.
Welcome to the trial version of a technology that is about to change text messaging forever.
Email, instant messsaging and VOIP have set a blazing trail in the way you communicate. You can now contact friends and family all over the world at virtually no cost. i-text is the final piece of this puzzle, changing the cost of the last remaining, and most expensive medium of them all - text messaging. With i-text, you get to send almost-free text messages from your mobile phone, in exactly the way you're used to.
To use i-text, you will have to pay your provider at their data rate, but this will typically be no more than a penny per message, depending on your provider. Some don't charge anything for the very small amounts of data in an i-text, which suddenly means text messaging becomes totally free, as long as you i-text.it.
So you can finally text that friend you made on holiday, keep in touch with family anywhere in the world, and even make friends with that great guy who happens to be on a different mobile network from you. And remember having to spend several times more just to send a text message to a different country? Well, you can forget all about that now, because with i-text, text messages will cost the same regardless of where they are going. You see, no matter whom you text, we will charge you the same thing: absolutely nothing.
So its a pretty new idea, and hopefully it should take off.
You can sign up at their website over at http://www.i-text.it and cross your fingers that you're one of the lucky few selected to test.
btw, I don't work for this company, nor am I affiliated with them in any way shape or form. There is, however, a referral box, and if you would like to use me as your referral, send me a PM and I'll give you my number (no perverts please! )