It was a drastic decision that I had to put in place because there were literally hundred of them per hour. All from 2.1 alpha It lasted about 1 week and then suddenly stopped so I removed the WordPress entry.
Since the 15th of Sept there have been 7031 attempts to spam my old blog.
3209 – No useragent
1749 – TrackBack/1.02
1338 – Opera/9.0
The rest are b2evolution, IE6.0 etc.