The news of the day is pubished on this post at IETF's MAIL-SIG list: Google has begun to sign outgoing email from Gmail with Yahoo's DomainKeys signatures.
DomainKeys is a technology for verifying both the domain of each email sender and the integrity of the messages sent and all the details about it can be found on the Yahoo's site. What is relevant here is that Google is the first big company to start adopting this standard, and I think it could be a big sign for the future.
Google has now a big impact on the IT world so... what could be this? A new de-facto standard? And what will be the future for the announced Microsoft Caller ID?