The 1.4.3 Pre-Release is ready for testing! Mojang has been hard at work fixing the many bugs found in the game - almost too many to list here! - and have prepared this pre-release for early playtesting! If all goes well, the official release of the 1.4.3 update is expected to be this coming Wednesday, November 7th. Check out the update, and tell us about it!
Also be sure to report any bugs you find with the official Mojang Bug Tracker, linked below.