[franze]

i'm skeptical

http://support.google.com/bin/answer.py?hl=en&answer=174...

  1e100.net is a Google-owned domain name used to identify the servers in our network.
  
  Following standard industry practice, we make sure each IP address has a corresponding hostname.   
  In October 2009, we started using a single domain name to identify our servers across all Google 
  products, rather than use different product domains such as youtube.com, blogger.com, and 
  google.com. We did this for two reasons: first, to keep things simpler, and second, to 
  proactively improve security by protecting against potential threats such as cross-site  
  scripting attacks.
  
  Most typical Internet users will never see 1e100.net, but we picked a Googley name for it just 
  in case (1e100 is scientific notation for 1 googol)

it's their servers, not their workstations. could be a plugin, maybe something on app-engine? at least an access from 1e100.net isn't a proof of anything.