Google behavioral targeting?

[SEMblahblah]

I've heard about something called "google's behavioral targeting" whr google shows up ads depending upon user's search behavior.
I really have no idea about it...any info would be appreciated!
Thanks

[RhinoFish]

Here's some articles about it:
[seroundtable.com...]
[searchengineland.com...]

There's got to be threads here about it as well. I just had these two links handy in an old email where I explained this to a client a while back.