This beta is mostly bug fixes, including one that fixes crash related to tear-off tabs. Also new is a way to quickly send SMS text messages to cell phones. Set a mobile phone number for your buddy in the Address Book and the send SMS option will be enabled in iChat.

Changes from 1.4.6:

• (New) Option to quickly send SMS messages over AIM to any user with a cell phone number in the Address Book.
• (Bug) Fixed a crash when closing messages after being torn-off
• (Bug) Fixed a minor problem when deleting the last log from a user in the log viewer
• (Bug) Fixed a display bug when using tear-off tabs with the tab bar position set to the top of the window
• (Bug) Yes/No buttons on the quit warning alert are now localized
• (Change) Automatic updates are now checked for every ten days