Late last summer, I got my first taste of Vineyard 48’s first new wines(as opposed to the old Bidwell stock they sold under their label), all not-yet-released whites from the 2004 vintage. The best of the lot was a nicely balanced semi-dry Riesling, but the others seemed either taut and un-yielding, or a disjointed. A little over six months later, I decided to re-taste a few of the whites along with three newly released 2004 reds — and there is reason to keep an eye on Vineyard 48. The first of the re-tasted whites, Vineyard 48 2004 Sauvignon Blanc ($14)…