Sacred Texts. Anything you want, it will be here. They also have a Polyglot bible which is awesome; you can compare Hebrew, Greek, Latin vulgate and KJV. There are billions of footnotes translating practically every word.
Bible Gateway. Dozens of translations.
The Theoi Project: making Hellenics the envy of all other Pagans.
You bastards.
CELT. Much in the way of decent translations.
Temnos Theon. Great for Greek or Greek-inspired Pagans. Includes ritual skeletons, FAQ, moral values etc.
Asatru Ritual Kit. Pretty good if you're unsure what you're doing.
Nshrine. Make an online "shrine" or leave a virtual candle at someone else's. There are some for gods, some for groups, some for people. I quite like it.
Archaeoastronomy. Astronomical dates for particular festivals, like Yule and Imbolc. Goes by the position of the sun... or something. You'll note that the astronomical date can vary from the traditional up to about a week. mentions the specific minute, too, which is neat.