Apple's MobileMe site at me.com used to be completely useless on the iPhone or iPod touch in Mobile Safari -- you'd get a splash page telling you to set up your contacts, calendars, and mail accounts, but that was about it. No webmail access, no direct access to galleries, iDisk, or even Find My iPhone. Apple introduced standalone apps that addressed some of these shortcomings (iDisk and Gallery), but there was still no way to access Find My iPhone unless you resorted to workarounds.
Things have improved somewhat with the new MobileMe page. Instead of simply admonishing you to set everything up on your Mac or PC, MobileMe now provides you with a link to instructions for setting up mail, contacts, and calendars. There's also links to download the iDisk and Gallery apps from the App Store. What's most useful about the change is you now have the ability to use Find My iPhone from an iPhone.
This might seem dumb at first -- "If I have my iPhone in my hand, why do I need to find it?" you may ask -- but if your household has multiple iPhone users and one of them leaves an iPhone at a pub, until now your only option was to dash home and try to find it on your computer. Now, you can access all the Find My iPhone features right at the moment your friend or significant other gets that wide-eyed, "I just misplaced a paycheck worth of electronics!" expression on his or her face. You can send an immediate message to the iPhone to get that loud, pinging submarine noise, which just might help you find the iPhone before you even leave the pub.
Find My iPhone is still only available as part of a yearly $99 MobileMe subscription.