Google Chrome is awesome, but in a seemingly controversial decision Google has chosen to auto update without the user's consent. There isn't even an option to turn updating off.
Rob Mensching has more on this and a very interesting selection of comments to his post.
I think Google has made a good decision in doing this, but as a power user I would like to know when this happens and what has changed when it does. The only reason why I am ok with this is because Google Chrome is a self contained platform and not a symbiotic piece of software like iTunes. Plus I recognise the security benefits and the benefits for Google in only having to support a single current version