Just a note: 

OT things i would like to see in scipy, if anybody has too much time:
* non-negative matrix factorization

NMF is already available in scikit-learn. 
 
* a data fitting function, aka curve_fit on steroids. Maybe lmfit, kaptyn or
mpfit.
* an bouded linear least squares solver, like bvls.
* Bayesian frequency estimation
* NFFT

Cheers,
Eraldo