By Lenn Thompson, Editor-in-Chief Tonight, let's take a look at the last of the Shinn Estate Vineyards 2007 reds that I tasted recently (there are at least 3 other un-released wines that I haven't formally reviewed yet) — Shinn Estate Vineyards 2007 Petit Verdot ($35/500ml). Much like malbec, is a petit verdot has spent more time in a leading role in recent years. But, also like malbec, there isn't really enough planted for it to become anything more than a member of the supporting cast in red blends and in small-production, almost-novelty wines like this one. This wine certainly qualifies…