New features: Read-only and RestoreRead-Only Participants
The creator of a wave can now change other participants on the wave between full access and read-only by clicking on their picture at the top of the wave panel, and selecting the access level in the drop-down:
As the name implies, read-only participants are prevented from making any changes to the wave, including adding new participants. They can, however, view live changes to the wave, and look at the history in playback.
You can make entire groups read-only as well, including the "public" group, which includes all Google Wave users. Note that individual permissions take precedence over group permissions, so even if a group has full access, an individual can be given read-only access, and vice versa.
Restore from Playback
Anyone with full access to a wave can now restore that wave to any previous state visible in playback:
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Serving better ads in Gmail
Ever since we launched Gmail, we've tried to show relevant and unobtrusive ads. We're always trying to improve our algorithms to show better, more useful ads. [+] Read More
When you open a message in Gmail, you often see ads related to that email. Let's say you're looking at a confirmation email from a hotel in Chicago. Next to your email, you might see ads about flights to Chicago.
But sometimes, there aren't any good ads to match to a particular message. From now on, you'll sometimes see ads matched to another recent email instead. For example, let's say you're looking at a message from a friend wishing you a happy birthday. If there aren't any good ads for birthdays, you might see the Chicago flight ads related to your last email instead.
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