Apple has just released their 5th iPhone and iPod touch app, MobileMe Gallery [Free - iTunes link] The functionality is as simple and elegant as the name suggests, pulling your MobileMe Gallery photos and movies from the cloud and showing them on your device. Sure, you could do this via Safari before, but there's an app for everything now, right?
UPDATE: Apple has posted the following on their MobileMe News page:
The MobileMe Gallery app provides a great new way to view published photos and movies directly on your iPhone or iPod touch. You can flick left or right to move through photos, pinch to zoom, or rotate your iPhone or iPod touch for a landscape view. The MobileMe Gallery app automatically stores photos you've viewed so you can quickly access them again, even without a network connection. And you can easily view friends' public galleries by selecting them from your iPhone contacts or entering their member name. See how it works in this video.
If you try it out, let us know how it works for you!
[Thanks to @markjboyce for the tip!]