On Saturday, I was picking some 2006 Crozes-Hermitage and 2001 Rioja at a wine shop, and sneaked a 5-min firehose tasting of a few Brunellos, while Rona and baby Evan waited in the car. The episode confirmed what I already knew - 2004 vintage of Brunello di Montalcino is fantastic. You can skip 2005 (apologies for gross generalization), and head straight for the 2006 just hitting the shelves - a very very good and cellar-worthy vintage, albeit still very young and tannic.
2004 Valdicava ($80) was delicious and ready to drink, but awfully expensive IMO. Both 2006 Casanova di Neri ($40) and Canalicchio di Sopra ($60) are worth buying and cellaring, with the latter being more complex, showing intriguing spice. I enjoy these base-level bottlings for their quality/price ratios, for half the price of their higher end (Riserva) brethren.