Google Chrome 5’s dev build has a feature that detects the language of a web page and lets you translate it without opening a new page. The feature is borrowed from Google Toolbar, but Google Chrome is the first browser that translates web pages without requiring an add-on.
When you visit a page written in another language, Chrome shows an infobar that asks if you want to translate the web page. You can ignore the message, change the language that was automatically detected or translate the web page. If you click on “Translate”, Google Chrome will translate the page and will no longer prompt you when you click on a link from the page.
Source: Google