A friend of mine in Portland designed one, but I'm not sure if anyone is producing it. I'll check with him and let you know...

i recently heard of a very simple AC which could be run off solar power.

You need an electric fan, several coils of copper tubing (more is better), a bucket of ice cold water and some hosing. Attach the copper tubing to the back of the fan. Attach the hosing so that one end connects the water bucket to the tubing and the other end will let the water run off out the window or into a sink. Run the ice water through the tubing (I would simply use my mouth to start a siphoning action). Arrange the height of the bucket and coils so that there is a slow drip. Turn on the fan.

Apparently, this method can be used to cool off a room. Please let me know if you try it and if it works!

There is already a technology that is used for refrigerators in RV's. It uses burning propane to evaporate ammonia in a closed system. The ammonia gets recycled and somehow cools down the refrigerator.

I'm sure someone has developed a product where concentrated solar power can take the place of the propane flame. It would make sense that the brighter the sun got, the harder the system worked to draw the heat out of the building.

I heard of someone using solar panels routed to inverters to run a swamp cooler.....

I think the most effective way would be to have solar panels that power your current ac system. You could think about the power being produced as directly powering your ac, but more than anything the solar panels will offset your total electrical cost/fossil fuel based consumption. There are many states that offer insentive/rebate programs for the installation of solar panels, but to produce just the power need to run ac you might not need it.