Just released the long awaited Mobile Me App for the iPhone & iPod Touch has been released to the App Store.
See Link on the Release: (AppleInsider | Apple releases MobileMe iDisk app for iPhone, iPod touch
I have downloaded and installed and first impression is that it works great.
It will retain up to 200 Meg in downloads. This means the last 200 Meg of file/downloads are retained and stored locally (you can adjust how much space you allocate this local storage).
One complaint is that there is a "file size" restriction of 20 Meg or 30 Meg (I have seen both values quoted).
So if you have a big .pdf you cannot view it.
Let me know what you think of this.