Really tasty frozen yogurt is a lot harder to make at home than it seems like it should be, but hounds highly recommend a couple of recipes:
This lime-vanilla frozen yogurt gets high marks from sugarbuzz.
And dukegirl is really happy with this recipe for chocolate frozen yogurt, with the caveat that she drains her yogurt for a few hours before adding it, and feels the added step makes for a better texture.
Board Links: Frozen Yogurt