Oh, I agree, Vera. Disney does not have a shred of originality whatosever. ^_^; But despite the convincing-ness of that page, I really think the Nadia/Atlantis stuff is a coinicidence, especially after seeing the film myself. I think the Kimba/Simba connection is far more plausible, mostly because it has much more evidence to support it, and I don't think Kimba was based on anything (except possibly folklore or something).

Anyway, having just returned from seeing it, let me say that I thought it was wonderful. The dialogue is well written, the characters are likable, the villains not readily apparent, and Thatch is one of the cutest Disney heroes in a long, long time (the fact that he's voiced by MJ Fox does not detract from this at all). As one would expect from Disney, the animation is beautiful and fluid, and it makes use of the fantastic 2D computer animation that I so love. I very much like the ideas about Atlantis that were presented (whatever their source), and none of the characters annoyed me (except for those that turned out to be eeeevviil and that was really only because I felt so betrayed). Really, the only bad thing about this movie was that it moved so quickly--I mean, we're talking about light speed here. It jumps and skips from one plot point to the next, with only a little bit of development in between (though what is there is good). Admittedly, you're working under the limits of films, and animated films at that (which are, in general, a good deal shorter than live action, since they take forever to create), but I mean, jeez. It wasn't a tour de force or anything, but it went by pretty fast. Still, it was a good movie, and I would see it again, if only to watch Milo bumble around like the skinny cartographer/linguist he is.
Also, this movie was rated PG (and you'll see why: it's not anything offensive, but it's definitely not the norm for a Disney feature), and it's not a musical--there's background/effect music, of course, but no one sings any songs and the only cute furry sidekick is Milo's cat Fluffy, who only appears briefly at the beginning, anyway. The film is also not afraid of subtitles and vocabulary--it's doubtful that the younger audience will know what 'linguist' and 'internal combustion engine' mean without the help of context clues or their parents. This is a Good Thing.
So, yes, I recommend this movie, regardless of whether or not it was ripped from Nadia. If I had to do a star rating, I would rate it about 3 out of 4 (same as the reviewer in my paper, actually). Not perfect, but good stuff.

And speaking of the reviewer in my paper--he gave Tomb Raider (which I've not yet seen) zero stars. HAHAHAHA.