Funny, I was thinking to do something like this myself these days, because the author of grr doesn't seem active any more, even on his Garage forums.

Only it would have been in PyQt, not C++...

For me, these are the main things lacking in the present Grr UI :

* the choice between viewing posts feed by feed (as it is now) and a single list of all new posts (like in Google Reader mobile),

* MORE KEYBOARD SUPPORT : move up and down in the new posts, mark all read, refresh, etc. Feedly does this very well !

* an option in Preferences to toggle "view only unread" globally for all feeds, not one by one... and remember it :-)

* masking the password in the login screen, and starting the network if offline, would nice additions as well...

If you did some of these, we could avoid a second fork :-)

TIA,
fp