Seems like a decent feature, but it would be a lot more useful to me (personally, anyway) if it sent a desktop notification of new emails any time you had a chrome window open, rather than only when you already have gmail open in a tab or window (which currently appears to be the case). If I have to have the inbox open somewhere anyway, there's not a ton of added value in desktop notifications, since I'm constantly switching between tabs, and it already has an indicator on gmail's browser tab if you have new emails.