I Found another Free SMS site today: http://www.topup.ie. They give 30 free SMS text messages a month and allow international signup and international sending.
I'm pretty sure there will be a GenieTexter script along shortly for this site :)
Update: and here it is :) topupie.xml
As usual you can download it and install it from here or you can wait for it to be added to the service manager, which reminds me, i really should get back to finishing the upload manager off, Dont worry, its nearly done promise! :)
EXTRA UPDATE: The topup.ie site is no longer giving away free SMS texts. If you are still looking for free texting try another one of the other free SMS service providers listed at the GenieTexter website.