Phantomn dBase Tables

Hi Guys,
Im running 3.1.1 with a few plugins and today noticed my site was awol, (could not connect to database) which I managed to fix by creating a new dbase_user and password.

The dbase_name had the following tables which I have never seen before
* wp_linkx_black_list
* wp_linkx_black_list_types
* wp_linkx_links
* wp_linkx_pages
* wp_linkx_settings

I dropped all tables and restored the dbase with a backup that did not include those tables above.

I also noticed my permalink structure was really wierd so I set that back to normal

I then backed up the restored database.
An hour later I had not received the backup so I checked the settings in Plugin: “WordPress Database Backup” and those darned tables were back.

Any clues greatly appreciated