I was getting a flood of lockout messages today from Theme My Login. Apparently, some bots have been hitting me pretty hard, and I had short-sightedly trimmed the lockout period to an hour. Sure enough, almost every hour on the hour, I was getting lockout messages.
I installed Admin Renamer Extended after a quick search and comparison with the other similar offerings, and couldn't be more pleased. All of my posts retained my public name, admin is gone forever, and the new username, well...it will be rather hard to guess.
Excellent job, and thanks, Ramon!