the new posts purple banner on top of the page is the single greatest addition, but it needs to float. If I'm at the bottom of a page, I dont like scrolling to the top to check if new posts show up. Should be able to dock that feature.
Do you notice the grey unobtrusive status bar on top of this browser window? It shows the same as the purple bar, it disappears when you scroll to the top. Also clicking outside in the empty space will bring you straight to the top.