Touch any day to view its details, and move from day to day with the navigation buttons at the bottom of the page. I did notice one problem. The "Quick Add" field is at the bottom of the page, and when I touched it to enter some text, the iPhone's keyboard rose to cover it, so I couldn't see what I was typing until I had hit "Done." I'm sure this will get fixed before long, but until then, brush up on your iPhone keyboarding skills.
[Via David Chartier. Hm, that name's familiar...]