Done with a clear cache and VPN’d into a couple of different locations, but hardly an exhaustive test:
A is for Amazon, B is for Bank of America, C is for Craigslist, D is for DMV, E is for eBay, F is Facebook, G is for GMail, H is for Hotmail, I is for Ikea, J is for Jet Blue, K is for Kaiser, L is for Lowes, M is for Mapquest, N is for Netflix, O is for Outside Lands, P is for Pandora, Q is for Quotes, R is for REI, S is for Skype, T is for Target, U is for USPS, W is for Weather, X is for XBox, Y is for Yahoo, and Z is for Zillow.
Some of these appear to be location dependent, VPN’ing into a server in Los Angeles gives me KTLA instead of Kaiser, Lakers instead of Lowes, Myspace instead of Mapquest, OC Fair instead of Outside Lands.