THE ORTHODOX CHURCH ONLINE
Bishop Kallistos Ware's classic introduction to Eastern Orthodoxy, The Orthodox Church, is now available as a free online book via the web. It's a great book -- however, the online version is so full of hyperlinks that it's not an easy read -- hard on the eyes if you try to read a whole sentence at a time. It's still worth the $10.88 you'd pay for an actual hardcopy. But if you're looking for a quick online reference the web version will do quite nicely.