Currently working on a couple of different setup. One is setting up mobile coupons for local restaurants, along the lines of text PIZZA to 1-111-111-1111 to get free drinks...then you can hit the list whenever business is slow or the restaurant has a promotion.
Another is real estate listings (this is what I'm currently working on setting up) - text ADDRESS to 1-111-111-1111 to receive more information - sort of like a digital brochure. The reason I'm targeting this one initially is that it has repeat business built in and even if it takes 6 months to sell a house using the system, the realtor will still make a profit on just that one house.
And the last one is one I heard about in a webinar last night...setting up a local job board where applicants text in to be on the list. The you contact local businesses that need workers and offer to blast it to your list of people looking for work. This is probably going to be backburnered until I get the other two worked out, but has some decent potential once it's up and going.
Plus, all of these offer a way to get your foot in the proverbial door so that you can hit the businesses with SEO services, mobile sites, video, social marketing...anything that you've got...