A 3-way tie, but all were oolongs this month:
the most brilliant single infusions were a new Dan Cong, Song Zhong #5 from TeaHabitat, floral, sweet, spicy, fruity, a bowl-you-over first sniff & sip tea;
the most satisfying, however, was probably some Da Hong Pao from Norbu, because what started as a minor musing (haven't had any yancha for a while) became a definite craving (I want some DHP) and reached a fever pitch (I NEED some DHP!) before I was in the right place at the right time with the tea, and then it took daily brewings for several days to satiate that craving;
and the most enlightening was a comparative tasting of several Alishan oolongs from Norbu, in which I finally 'got' the distinctive flavor of the jassid-bitten leaves from the summer 2009 'high mountain beauty' tea.
Today, Hon Yama Zairai sencha from Norbu.