Google Adwords announced that from February 2011 the location targeting accuracy will be increased.
This means that for those campaigns which focus only on a couple regions visibility of their ads will decrease.
Depending on your campaign strategy a resetting to a broader “catch area” you want to target might be useful.
On the other hand, it is very delightful to see that the Google Adwords team keeps up with Google’s “way of doing things” by improving even minor inefficiencies in a speedy manner.
If you would like to know more details on the exact locations Google Adwords increased their targeting accuracy you can visits their support site.