Timeline feature is now out of beta and available to all users worldwide. Originally announced during the f8 conference back in September, it wraps up all the information you've posted, friendships you've made and embarrassing photos you were tagged in, in a neat, date organized package. If you're worried it may uncover some things better left private -- and posted years ago before you were more savvy about social media -- you can enable the feature and still wait a week before it goes public for viewing by others. Currently timelines are visible on the main site, via the recently updated Android client and the mobile version of the site. If you want to turn it on right way, head to the Introducing Timeline page and click Get It Now.
Update: Facebook has just rolled rolled out a fresh version of its Android app that you'll need to grab for Timeline access there, the change log (after the break) also mentions changes including access to games & apps, new push notifications and a new photo viewing experience.