You may want to get a random password generator and keep an eye on your e-mail if you're an Origin user. Some users have reported recent hacks to their accounts, after being notified of unauthorized password changes via e-mail.
A NeoGAF thread (via Eurogamer) documents a handful of cases of the hacks. In the worst case, it locked a user out of his or her account, leading to a frustrating recovery process. EA support reportedly said it is "escalating" its look into the hacks.
While EA support can restore the accounts, which is the point of e-mail notification in the first place, it can be a bit of a hassle. The problem may not be widespread, but it's best to err on the side of caution. Shacknews has contacted EA and will update as more information becomes available.