Variety takes a look at the major Oscar categories and breaks them down. In the Feature Animation category:

Finding Nemo: “the year’s top grosser”, “The only thing that would jinx Disney/Pixar’s digitally animated Finding Nemo is the unexpected interference of a Chicago Cubs fan”, “That the Academy of Motion Picture Arts & Sciences appreciates this film is obvious (see its three other noms). Were there no animation category, Nemo would have been a serious contender in the picture category”

The Triplets of Belleville: “A likely spoiler for Nemo’s party”, “The nearly wordless beauty, charm and quirkiness of the animation have made Triplets a favorite at festivals, on the arthouse circuit and with animators”, “That this film also got a nom in nonanimation… shows it has a lot of support”

Brother Bear: “the least likely to win the award”, “this is possibly the last 2-D animated film Disney will make for a very long time. That could work in its favor as the Mouse House has not won this category, now in its third year, for a film of its own and some may want to take this final chance to celebrate the past before CGI and foreign toons… take over”
 
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