I have some anime on DVD that's in widescreen, but most of my anime collection is fullscreen which I don't mind as it's the original aspect anyway. I've noticed my anime DVDs have beautiful looking animation such as Please Teacher. It looks so good on DVD. I'm not sure why.
There's some anime product tie-ins, including Hello Kitty which I'm sure you've all seen everywhere like I have. Pokemon, all the other usual ones. I definitely recommend anime but make sure it's suitable for kids.
Hmm... best scene in widescreen probably would have to be the Empire Strikes Back where you actually get to see ALL the bounty hunters lined up, and you miss out on it a little in fullscreen. Makes you really appreciate widescreen. Also, the LOTR trilogy, when showing scenes of the surroundings, it's breathtaking.
