You can download Norton Antivirus 2010 Beta from here:

http://www.symantec.com/norton/beta/download.jsp?pvid=nav2010

It seems that anyone can download Norton Antivirus 2010 Beta from the page listed above.

However, if you are not able to do so, here is the 'direct' link:

http://www.symantec.com/norton/beta/downloads/fsd_client/NAVBetaDownloader.exe

You can download Norton Internet Security 2010 Beta from here:

http://www.symantec.com/norton/beta/download.jsp?pvid=nis2010

Unlike NAV 2010 Beta, it seems that only those in the United States can download Norton Internet Security 2010 Beta from the page listed above. (tip: you can always use a US proxy) or better still, you can simply download it from this direct link:

http://www.symantec.com/norton/beta/downloads/fsd_client/NISBetaDownloader.exe