There is a shortcut N that will jump to another post in the same feed ("subscription") but will not jump to another feed when the current post is the last one.
Then there is a spacebar shortcut that will scroll down one page and switch to a next feed if necessary but if a post is very very long, I have to hit the spacebar many times in order to reach the next post.
Is there something like N that will also take me to the next feed if necessary?
Shift-J/K will navigate feeds/folder, then Shift-O will start reading that feed/folder.
What you are looking for is the j/k for next/previous posts.
For more info on shortcuts in Google Reader press ? to check them all.
FWIW, I use g-t to to bring up the tag window, then the first letter of the tag (I read tags at different periodicities).
Also, g-u brings up the list of subscriptions, where you can type in the feed name. But I always find this a bit overwhelming. In a pinch ? brings up all of the shortcuts.
