Nathanael Robinson at "The Rhine River" notes that Friday is the 150th anniversary of Heine's death. I've only read some Heine (in translation, since my German consists of tatters), but Heine is a very thoughtful and thought-provoking poet. Some of Heine's works in translation online:
Selections from Heine's essays
On Teleology
Doctrine
O Death, that is the Cooling Night
Selected poems
