I have one basic rule when giving out my information online: can I trust this person or company with my information? Usually, this translates to “are they going to take my CC# and buy bootleg Tommy Jeans with it or not?” Usually, large companies can be trusted with such information…most of the time. So, can I use Microsoft’s Passport service and trust that they aren’t going to track where I’m spending my Web time and money? Probably not. Why? Two major reasons: questionable track record and that sort of information would be *extremely* valuable to them.