Favorite Neural Network libraries

Hi,

Suppose I wanted to create a new Neural Network module on CPAN 
that wrapped around some popular NN C library.  What library 
should I choose?  Are there any front-runners that people might 
recommend?

There's already an AI::NeuralNet::BackProp on CPAN, which is a 
pure-perl implementation.  I think there's probably a need for 
both.  There's also an AI::jNeural, but I haven't been able to 
make heads or tails of its documentation.  I'm also not sure 
about the comparative strengths of libjneural versus other 
libraries.

  -Ken