janharders - 4:48 pm on Jul 18, 2008 (gmt 0)
my best guess from what I'm seeing is that the dublin IPs (which aren't even officially assigned to google) are just a proxy. And why not, it makes sense to have a central application and a central gateway. Keep in mind, those quality raters won't be official google employees, at least not really inside the circle, most are students etc. Keeping track on how much they work, if their work is up to google's standards and if they don't use their magic powers to secretly push their own / some sites, it's the best idea to have them use a proxy that logs their work.
I've seen raters come from that IP range, then, shortly after on a fresh site with absolutely no traffic, the same useragent came with a local IP from germany (testing if any cloaking is going on, I guess). It was obviously not a bot or a very, very advanced one (handling css + js, filling out forms and the like).
For google services like base, they are death's accountants. You see one, pray you stay alive.