Some of you may or may not have heard what happened to Wired journalist Mat Honan, but you should. Here is the article:
How Apple and Amazon Security Flaws Led to My Epic Hacking | Gadget Lab | Wired.com
Gizmodo (and no doubt many other tech sites) has done a write up on how to protect your online identity:
9 Things You Absolutely Must Do to Keep Your Online Identity Secure
Most of it is basically a summary of what has been published on the interwebs before, but regardless, its worth a read and a good reminder to look into tightening up your online practices.
No doubt the usual suspects here will pipe in saying Google evil, I never do anything online, I use pen and paper, my memory rocks, etc. Ignoring those guys, I do personally think both articles are worth a read.