Blizzard has released a small patch that fixes issues with the newly released Blackwing Lair and has some improvements for the Macintosh client.
As such, the Blizzard site is really slow at the moment. I do not know if this is affecting game servers, but as is typical with Blizzard patches their whole operation tends to slow down a bit. Here are the full patch notes though for 1.6.1 for World of WarCraft:
General * Spell casting is no longer interrupted when leaving combat. Warriors * Improved Shield Block - Fixed a bug where Rank 3 of the talent was not granting the extra block. * Bloodthirst - Damage bonus increased to 40% of attack power. Items * The Oil of Immolation effect is no longer affected by bonuses to spell damage from items. Raids & Dungeons * Blackwing Lair o Several encounters in Blackwing Lair now cause the front gate to close, preventing players from zoning out or joining an in-progress battle. o The Razorgore encounter has been changed slightly to make it less "random". The spawning should be more consistent throughout the fight. o The timer for Vaelastrasz the Corrupt is now more persistent. You can no longer reset the one-hour time limit for beating him by leaving the instance. Also, Vaelastrasz the Corrupt will not respawn for 12 hours if he has not been beaten when the timer expires. o The drakes in Blackwing Lair will no longer leave the lab. * Maraudon o Lowered experience values for Creeping Sludge. Macs * Increased the maximum number of sounds which can be played simultaneously. This will fix problems where some sounds could be dropped in very busy situations. * Fixed WoW Error Reporter so that it doesn't crash under Mac OS X 10.4 when trying to send an error report. * Worked around an issue where you would lose your Expose/Dashboard preferences if you crashed or asserted while in fullscreen mode on Mac OS X 10.4. * Fixed the "blockWidth", "srec", and "bitnum < m_numBits" assertions bugs that would crash the game. * Fixed a bug involving corpses near the player that could result in a crash ("BusError").
Just log in with your WoW client to download the patch. FilePlanet also has the patch up, and I expect 3D Gamers will have the patch up on their site later in the day.
Links
Blizzard Entertainment - Source
FilePlanet - Download
3D Gamers - Download
