Apple Legal has been doing its best 
to take down screenshots that break its non-disclosure agreements, but I guess the sheer volume of posts almost guarantees that some will get through.
Spilled Cow has posted six screenshots of Leopard Mail (notes, making a to-do, a note with a to-do, a to-do list, adding an RSS feed and dispalying an RSS feed).
HardMac (Le Macbidouille) has more detailed shots of to-dos and to-do options.