I normally go to http://stackoverflow.com/users/recent to see new comments or messages. I have it bookmarked in the toolbar. As of today, the link no longer works. Any idea why.
The envelope that linked to the recent page was recently removed and replaced with the activity dropdown (hover over your username at the top of the screen to see it). Accordingly, as there is no other way to get to the recent page, it was deprecated and removed.
Comments and answers are available in the Global Inbox (upper left hand corner—the red number indicates new responses—click to see), and reputation and badges are in the activity dropdown.