i just made another batch of soy yogurt using a bit of the previous batch and i've now seen a bit of a pattern with regards to what brand of soymilk i use. every time i've used 'so nice', i have gotten a nice, custardy yogurt that has little to no whey. when i've used other brands (so far, i've used 'natura' and 'vitasoy'), i've found that i get a thinner yogurt and with quite a bit of the liquidy whey. i'm now convinced that using 'so nice' is the way to go for me. i just pop it in the oven (not turned on) by the oven light and leave it there for about 10 or so hours, then pop it in the fridge for 2-3 days to sour up.