  The impact of the recent very precise CLAS and COMPASS g1/F1 data on
polarized parton densities and higher twist effects is discussed. It is
demonstrated that the low Q^2 CLAS data improve essentially our knowledge of
higher twist corrections to the spin structure function g1, while the large Q^2
COMPASS data influence mainly the strange quark and gluon polarizations. It is
also shown that the uncertainties in the determination of the polarized parton
densities are significantly reduced. We find also that the present inclusive
DIS data cannot rule out a negative polarized and changing in sign gluon
densities. The present status of the proton spin sum rule is discussed.
