Okay, say "hello" to our new (dynamic) /robots.txt; what you see there will depend on what hostname you use to visit PerlMonks. Compare http://perlmonks.net/robots.txt vs. http://www.perlmonks.org/robots.txt.

Now we see how long it takes google, et al, to notice and then wait for the traffic levels to rise until the site becomes just annoyingly slow enough that we reach equilibrium (which I think explains the quite flat site traffic level prior to shutting out the search engine spiders).