Alphanumeric keypads - they're the future
Yahoo is hopping on the bandwagon with free emails to texts. Seems to be only in the US at the moment, but hopefully it will come our way soon.
And without much fanfare, Google already started offering free online calendar alerts by text, which I think is a first in the UK.
More text messages are sent everyday than there are grains of sand on the Earth (Source). If online companies are starting to embrace mainstream texting, instead of fancy things that no-one uses, then all the better.