Unsurpsingly, it's all down to gears 3 and Halo Reach. Considering those (as in previous games in the franchises) games sell 6 million it's not that suprising. And since GT5 has been in the making since the start of the gen and these were announced relatively recently, the buzz is going to be higher for these 2 titles as they have less info on them so far.

And more solid release dates.

okay, so now i'm just having fun with google insight. fun fact, natal has quite a bit of insterest but for whatever reason most of the interst is coming from south africa, brazil, and portugal.

I don't think Natal was part of it. Gears of War 2 and Halo Reach seems to be the pull factor.

If it's anything like all the other 'buzz' metrics I've seen, it has almost no bearing on how well something will actually perform in the market.

this really doesn't prove anything

It's a bit weird that they don't list what formula they used to get the score they calculated.  It would have been pretty easy just to list the raw "Web Search Interest," but it would be interesting to know how they are getting a value for search interest by comparing to CoD.

For those interested, I've looked up the totals (which seem to be normalized against 100, so I'm not really sure if they mean anything.  Though smaller games tend to get really small numbers.)

The format is:

Game - total search interest over the last 30 days -> total interest over the last 7 days.

Halo Reach - 58 -> 88

Gran Turismo 5 - 71 -> 84

Gears of War 3 - 76 -> 89

Fable 3 - 56 -> 88

Crackdown 2 - 50 -> 76

The Last Guardian - 73 -> 90

Killzone 3 - 43 -> 73

LittleBigPlanet 2 - 59 -> 97

Infamous 2 - 30 -> 86

Gran Turismo 5 is most popular in Australia...  Killzone 3 does its best in the UK (though it doesn't seem to have any interest outside of the UK and US...  Fable 3 also doesn't seem to have data outside the US...  very weird.)