Ok, so this is probably a bit unconventional, and I haven't been growing for that long... But I've been using a Fantasy Anion humidifier (pic:
http://www.aidandtrade.com/member/am...idifier_80.jpg).
It's very artistic and adds to the decor...(I already had one before I got into orchids). I've set it up right next to them and have a non-oscillating fan set on low that is aimed at an angle at the wall to create an air current that first bounces off the wall then hits the humidifier and softly blows the humid air across the orchids. The plants closest to it get more humidity and it drops off rather quickly (within a few feet). In a way it's kind of similar in sound and such as having a fountain.
There is a down side though: It doesn't hold a lot of water. I find I have to fill it in the morn. then again in the evening.