10.8.1 is live and fixes a few annoying bugs. Personally, I’ve noticed battery life diminished and audio was spotty when connecting to a Thunderbolt display upon upgrading to Mountain Lion. 10.8.1 aims to fix this.

Other key improvements:

• Resolve an issue that may cause Migration Assistant to unexpectedly quit
• Improve compatibility when connecting to a Microsoft Exchange server in Mail
• Resolve an issue that could prevent iMessages from being sent
• Address an issue that could cause the system to become unresponsive when using Pinyin input
• Resolve an issue when connecting to SMB servers with long names
• Address a issue that may prevent Safari from launching when using a Proxy Automatic Configuration (PAC) file
• Improve 802.1X authentication with Active Directory credentials.