the kvisoft thing appears to be $100!!! If you must recommend 3rd party software, could you name a free one please? Apart from that the premise of the site is to learn to program. A flip book should not be that hard. Saving the output might be tricky, though.
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If you want to have a free* flipbook software, I suggest you use Flipnote Hatena on the DSi. It's a huge community and a simple flipbook software. It's free in the DSi Shop. Just make sure you have internet connection in order to upload!
*Free upload. However, the DSi itself is not.
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