Amanda
I do think yes/no questions can be answered by tarot. I don't think the reverse/upright type spreads are effective, nor do I think you can set specific cards to mean yes and others no.
I agree with this.
JSNYC had a good Yes/No spread that is posted on this forum and it is the one that I typically use when I do Yes/No readings. Instead of affixing 'yes' or 'no' to particular cards (or using uprights/reversals), he developed (I think seven) "key" type of cards to have an inflection in their tone regardless of whether they landed in a Yes or No position. For instance, the Magician was a key card and it's tone was emphatic so if the Magician landed in the Yes position, it was basically saying, "Yes, definitely! You can definitely make that happen!" and if it was in the No position, it was basically saying, "No way! You can't do that!" and then it was designed to also interpret the opposite position and an 'additional information' position, where you get a better sense of things by weighting them all together so that it is possible for an answer to be, "Yes, but.." or "No, if..." -- by giving certain 'key' cards a tone of inflection, rather than a strict meaning, it makes them doubly versatile for either a Yes or No position. I have had some really good feedback here on this forum by utilizing that spread.