Pfui - 5:37 pm on Apr 25, 2010 (gmt 0)
@thethrasher: Did those Hosts run the "ResearchProject" bot against your site(s)? (There are 1090 planetlab nodes at 503 sites world-wide.)
FWIW: There's no "ResearchProject" per se on the planet-lab.org site, either by name or an as active or inactive project. Unless we see it run from another planetlab-specific subdomain somewhere, it may just be someone's pass-around effort.
Regardless of who's running it, I'm curious to know what it tries to do when not 403'd from the get-go but for robots.txt, which it neglects to get.