For this I modified a little script written by Dave Thomas:
egrep -o 'xmlUrl="(.*?)"' google-reader-subscriptions.xml | sed "s/.*xmlUrl=\"\([^\"]*\).*/\1/" | pbcopyYou need to have the whole script in the same line.
This modification isnecessarybecause Googles format can not be read by Dave's script without errors.
After executing this script you can execute the third step from Dave's task:
In Mail.App, select Add RSS Feed, and in the text area that pops up, paste in the clipboard.Then after a while with high CPU load Mail.app contains all your feeds.