Google launched their seventh dev version of Chrome, the browser which attracts many people by combining the minimal design with sophisticated technology, making it one of the fastest and one of the most advanced browsers available. I'm using it on both my Linux and Mac OS computers and, as expected, you won't see any important changes compared to the previous version.
Of course that there are many changes, but almost all of them are in the background, and they are not observable for the end-user. If you're on Mac, you'll feel that the loading time of the webpages was reduced, making it impossible for any other browser to keep up with it (Safari, Opera, or the so acclaimed Firefox). Most of the webpages load, literally, instantly, and if there are any delays, they are caused by the DNS or by the latency of the network.
Regarding the update, if you're on Linux and you used dev versions before and updated the system regularly, you already got Chrome 7 dev.
If you are a Mac OS X or Windows user (or a Linux user who needs the dev version), here is the official link where Chrome 7 dev is available for download: Google Chrome 7 Dev (it should automatically give you the version of Chrome according to your OS).