Both the 32- and 64-bit versions of Windows 7 RC are available in five languages: English, German, Japanese, French, and Spanish. Just choose the version that fits the system you'll be using for the test, pick your language and click go to register for and download the software.
Downloading Windows 7 RC could take a few hours. The exact time will depend on your internet provider, bandwidth, and traffic. The good news is that once you start the download, you won't have to answer any more questions – you can walk away while it finishes. If it gets interrupted, it'll restart where it left off. See this FAQ for details.
Looks like the download service is rocking and rolling at the moment. In order to write this blog post, I needed to download and install Windows Live Writer, look up my FTP password, and get the profile all setup. The download manager (as indicated below) has already downloaded half in that short period of time.
Let’s hope that kind of performance continues through the week and weekend. I think you are really going to enjoy the release candidate. Enjoy!