Marxists Internet Archive
Marxists.org: "Existence and Being" by Martin Heidegger
One of Heidegger's works that is "easier" to read. Does require some background information, but a good way to introduce one's self to Heidegger and his peculiar writing style.
New Advent
Catholic Encyclopedia: Giordano Bruno by New Advent
Entry in the Catholic Encyclopedia. Conatins biograhical information, and an explanation of his works/ideas. Please note that ?The Catholic Encyclopedia? is a historic reference source and should be viewed in the context of resource...