Well, this is a beating the dead horse type topic.
You can use the search option on top to search for "birth control"
I guarantee you'll find at least 2 threads dedicated to the discussion.
Anyway, in short I think the answer is as follows:
Abortificant birth control (RU-486, the Pill, etc) are forbidden.
Condoms and the like, artifical barriers, are permitted with permission of your spiritual father.
Personally, if you think one of the perks to becoming Orthodox is that you can be more lenient in regards to birth control, I think you are probably wrong.
Again, read the previously posted threads, they are real detailed, and if u wish to add a comment, feel free to do so.