Webmasterworld has added a robot.txt file that disallows all user agents - thereby stoppping all Search Engines visting the site. This huge step by the operator and has already sent a ripple across the SEO community. Brett, the site owner states his
reason is becasue of rogue bots visiting many million times a day... this is an odd decision - you can ban rogue bots in many ways.
Link:
http://www.webmasterworld.com/forum9/9593.htm
This action has thrown up a much bigger question:
Do we actually need Search Engines as a promotion tool?
- or is Word of mouth/advertising good enough (assuming the product is quality)
A paying member in another thread mused that it might be a SE gaming technique to ensure that the site receives so many quality backlinks that he cultures a PR10 site (or second highest after google) that he could sell to the highest bidder.
That's a far fetched theory but the consequesces of this action could actually effect Google stock. Really.
Oli - ever considered this? I doubt it

but as an it's experiment defintely worth monitoring.