I may be taking my Macbook to the Apple Store to replace the battery (I'm not sure I want to mess around with it myself). Should I be concerned about data security, since I keep lots of sensitive client/financial stuff on it? I know they'll want my password, etc. I don't particularly mind wiping the drive beforehand, especially since I was thinking about updating the OS anyway. Or I guess I could just encrypt the sensitive folders.... What's your preferred strategy in these situations?