The RSS Feeds for a Community Weaver 2.0 site are considered private.  You have to be logged into the site with the right level of access to see them.  Unfortunately Google Reader does not support this type of RSS Feed.  There are however other free and paid for feed readers which do support private feeds.  Depending on your web broswer, you should also be able to bookmark the RSS Feeds and view them in your browser.  You will need to be logged into the site with that browser to view feeds this way as well.