blockchain.info appears to not allow wallet logins at this time. I've tried from a couple different browsers and the iOS app. After clicking the "login now" button, it grinds away for a bit before returning to the originating page. Clearing the browser cache makes no difference.
The site looks to be partially down. At the bottom you can see this:
I first noticed something was wrong because my client knew about 2 blocks that blockchain.info didn't...