I have thought about the potential problem of being too search engine visible, and also even played with the idea of the "code name standard" too. While I have taken some measures to keep some of the search engine traffic away (for practical purposes, i.e., nonsensical spammers and the like), I think taking active action to intentionally hide our conversations here would be like admitting to some wrong doing--and I do not believe that the intentions of the vast majority of the members here are malicious. The few with questionable intentions that tread beyond what is legal, will eventually be dealt with through legal action by those they offend, if the offended feels so inclined. Overall, I feel this is a great group that I'm grateful to be a part of.
However, while we're on the subject, the "some measures" that I spoke of above involve 'asking' search engine crawlers not to search these forums. I have been doing occasional checks to see the effect. Google's page rank for this forum is effectively "0". Other clues also leave me to believe that search engine crawlers are not indexing this site but rather Google is indexing the LINKS that point to this forum from MEMBER'S links on their websites. Essentially, this is why the "standard codenames" would not work very well--because Google/Yahoo/etc... isn't indexing this forum directly; they're being pointed to specific links on all the member's websites that provide links to specific topics throughout this forum.
As far as the major search engines are concerned I stopped allowing them to index these pages directly. If the members want this forum to be more under the radar, they would have to decide to remove the links on their personal websites that link here.