Loads of stuff in this one, but muttley may like the fact that you can now turn off the background poller and have Shelf look for context only when you hit a global shortcut key. This will also make life nicer for people with smaller screens who don’t want this widow popping to the foreground every time it can figure out who you’re looking at.
Other than that, there are lots of improvements. Shelf should be faster and make less gratuitous network requests. Feed display is prettier, and I make an effort to display recently updated feeds at the top, rather than in random order.