The thing about being online is generally speaking *someone* is going to know about you. If you use a different search engine to avoid Google tracking, then Bing/Yahoo or someone else will know about you instead. And quite frankly I'd rather Google have that info than Microsoft. They've proven over 10 years to be a lot more friendly to my personal philosophies than MS or many other big companies.
I think there are two legitimate concerns here. 1: consolidation of lots of informatio in one place. Yes, this is a *potential* problem - the question is how the information is used. Google seems to be one of the more reasonable in this regard, never spamming me, never (so far) selling my info to other companies in a way that identifies me, basically I'm never affected *negatively* by how Google uses my info. That leads to point 2, which is even though Google (IMHO) doesn't abuse its information now, there is always the possibility in the future that it will, or (perhaps more likely) that it will fall on hard times (maybe due to a coming advertising crash?) and then will sell more identifiable data to stay affloat. I don't consider this scenario to be extremely likely, but it is a legitimate concern.
The thing is, when *I* think about any of these possibilities, well it just doesn't concern me much. I guess maybe I don't have a lot to hide, but that's not reason enough alone not to be worried, of course. I just look at Google's business history, and at the general Internet environment, and I feel that *if* I choose to participate in the Internet at all, short of being a chronic "Anonymous Coward" (Slashdot

), I really have little choice but to let people know a bit about me, what I do, where I go. And you know what? I think it's a reasonable trade-off for what I get in return, especially when the company in question is - so far - pretty surprisingly "good".
- Oshyan