Most rss readers support exporting or importing feed data via an opml file. To create an opml file based on your google reader feeds:

1) In google reader Click on the manage subscriptions link, It will likely be at the bottom of the left hand side of the site.
2) On the page that comes up, click on the "export your subscriptions as an opml file" link.
3) Choose a name and save the file
4) Use the opml file to import your feeds in the rss reader of your choice (the details of which are left as an exercise for you, as I don't have an N900 )