+ I prefer to see the RSS text before I see the original site. Easier reading (no nav or ads) and I'll click through if the content catches my interest. So it would be nice if I clicked the feed tab that tab would stay selected as I browsed my other feeds (rather than switching back to the default original tab)
+ I use folders in GReader to group my feeds. I have a ton of feeds and a lot of them are not updated often. One of my favorite features of GReader is the ability to click on a folder and see that folder's feed. Saves a ton of individual feed reading and the folder mark as read is a time saver (I read the headlines and don't want to read the individual topics)
+ I need better marked as read (a button). The context menu is nice but requires two clicks (give me a hot key).
+ The config icons in the bottom sidebar get lost behind chrome's stupid appearing status bar making it frustrating to use these when the feed is loading.
+ Minor - I'd like to see the feed list above the site or rss txt body (more like a email client) Is there a way to configure the layout of the panes?
In all this is pretty exciting!