Hey, this is cool: According to Engadget, Cloudmark seems to be working on the next frontier of spam filtering: SMS spam. Give it a few years, and something like this will be baked into every provider's infrastructure or handsets. Can't wait.
On an unrelated note, I never got a drop of SMS spam in the years that I was a T-Mobile customer. Last week I switched to Verizon (iPhone 4!), and within a few days, I got my first SMS/billing scam, from somebody called SendMe Mobile, where they tried to sign me up to a $9.99/mo SMS trivia thing without my consent. I wonder if I'm going to see more of these kinds of things, now that I've moved to the US wireless provider with the largest customer base.