If you like the idea of keeping your bookmarks, passwords, apps and other data synced between Chrome browsers, but you're wary of Google (or others) getting access to your web life, the latest Chrome dev release syncs data with a passphrase.
Open up Chrome's options, head to the Personal Stuff tab, then click "Customize" in the Sync field. Note the new presence of a new "Encryption" tab at the top of the pop-out window: it's where you set up your passphrase. Once you set it, nobody can sync your data to another instance of Chrome without your passphrase, and Google itself will supposedly be unable to grab it, because the company states the passphrase is stored encrypted on their servers too.
Which is not to say your passwords and other data can't be had on your local machine, as we've previously pointed out. But for those who like a little more lock-down for their cloud data, it's a nice addition. You'll need to upgrade to the Dev release of Chrome to make use of Encryption now, but it's likely on its way down to the Beta and Stable channels soon.