AlyssaS - 12:59 am on Sep 24, 2010 (gmt 0)
The test is to methodically check position for a small handful of keyword phrases at regular intervals
I think some proxy checking might also be in order to see geographic variations. Or, even better than a proxy (whose IP is usually well known to Google) would be if you have access to a VPN and can use that to check.
You can easily check SERPs position geographically using Adwords.
You need to do the following:
Then enter your keyword and select your location. For every country, they is a sub list of local datacentres.
Then press preview ads, and it brings up the organic SERPs for that location.
It's an eyeopener - you can see exactly where you rank in a whole host of locations.