FYI, Puerh (or pu-erh) tea is a tea grown primarily in Yunnan Province, China, usually pressed into tea cakes for ease of transport. Originally made for sale primarily in Tibet, it was carried on horses along the "Ancient Tea Horse Road," which still exists.
It's an earthy tasting tea, prized by collectors, and can get quite pricey, depending on vintage, manufacturer, rarity, etc. Usually served "gong-fu" style (a stylized serving ceremony) in Yixing clay teapots and tiny cups. For a full discussion, see http://en.wikipedia.org/wiki/Pu-erh_tea.