At Facebook’s Places event earlier tonight, they noted that their iPhone app would be updated tonight with the new check-in functionality. Sure enough, here it is. Though the App Store update alert hasn’t kicked in yet, if you go to the actual page and redownload it, it should be the latest version (version 3.2).
As you can see, the new Places area is front and center in the app. Clicking on it brings up a list of your friends who have recently checked in to various places. Clicking on those friends shows more details about the place they are at.
Friend check-ins are sorted by those friends who are nearby and those who are elsewhere. Your stream will now show these Places check-ins as well.
One thing that’s oddly tricky is actually checking-in yourself. I seriously cannot figure out how to do it right now. Lemme know what I’m missing. We were told it may be a while before the full funtionality rolls out to the app, so perhaps Facebook is holding some small element back for the time being.
Still, on the touch.facebook.com version of the site the functionality is working and seems much more obvious.