  We discuss diffractive hadron leptoproduction in terms of skewed gluon
distributions and within two-gluon exchange model. Connection of the two-gluon
approach with skewed gluon distributions is found. The double spin asymmetries
for longitudinally polarized leptons and transversely polarized protons in
diffractive vector meson and $Q \bar Q$ production at high energies within the
two-gluon model is analysed.
  The asymmetry predicted for meson production is found to be quite small. The
$A_{lT}$ asymmetry for $Q \bar Q$ production is large and can be used to obtain
information on the polarized skewed gluon distributions in the proton.
