Yeah, I've studied 1 Enoch a very great deal...as I've said before, it is essential reading if you want to understand Judaism as it was in the time of Jesus and the apostles. It contains an enormous amount of information on what some Jews believed between the fourth century BC and the first century AD and it shows how certain beliefs prominent in Christianity emerged and developed in earlier Judaism. It also reveals some of the diversity in early Judaism and some of the ideological struggles between different factions (such as the calendrical dispute between the Essenes and Pharisees, which is especially marked in later Essene writings). The very close relationship between 1 Enoch and Daniel also sheds light on the historical milieu of the canonical book.
To go on from here, the Dead Sea Scrolls contained a section called The book of Giants. Also fascinating!
The contents of 1 Enoch varied widely, and the Book of Giants was probably the second section (after the Book of Watchers) that was displaced from the later version of the book in order to make room for the Book of Parables (which was absent from the copies of the book at Qumran). The third section, the Book of Luminaries, also circulated independently in fuller form among the Dead Sea Scrolls. The Book of Giants is especially interesting in light of its use of Mesopotamian mythological traditions (e.g. the apperance of Gilgamesh and possibly Ut-Napishtim in the book), and its significance as a possible source of ch. 7 of Daniel.