Whoa, I had no clue they did this...
If any of you stay logged into your google account, they track and record everything you do.
You can see how many queries you search per day/month.... your top results, top sites, top searches, suggested searches, etc.
Kinda creepy. I use google constantly, so I found myself looking at a summary of my internet use for the past 6 months or so.
I also found out that I can't spell appreciate. I occasionally plug a word into google to do a spell check, and that word by far outnumbered the rest for checks.