Now that the Brazilian air force’s media-assisted "debris trail" has been debunked, it’s probably best to ignore whatever the mainstream media produces on the disappearance. But several good sources remain. One of the best is the (mostly) informed speculation at Airliners.net. Best weather analysis still is here.
UPDATE: Well, make that debunked, and then resucitated with more detail than before.
THE TEXAS SCRIBBLER 