I am still running 3.1. I installed this two months ago on two low traffic personal sites. Since then each site has blocked over 13, 000 or more attempts to login to the admin account.
I am glad to see that the plugin appears to work with 3.6.1. I need to upgrade my two sites.
Note that my stats prove what an ongoing attack on WordPress sites is underway, trying to exploit logging in as admin. Bots run 24x7 scanning for sites and trying to login.