PrimedTnt do not break blocks/does less damage when in half slab.
EDIT: Sometimes does not break any other block except the half slab itself, some blocks on top of the slab will be destroyed, see picture.
It works with any other half slabs except wooden ones.(see pic 7 & 8)
Explosion is normal if PrimedTnt is on top of double-slab, or upward-facing slab.
Blocks will be damaged if the PrimedTnt is outside the half-slab (see second last picture)
WORKS WITH ENDERCRYSTAL TOO
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Confirmed in 1.8.1-pre2.

I remember that some slabs have a REALLY high explosion resistance, more than regular stone. Not sure if intended or bug. Good catch though!

can confirm in 15w45a
That may be simply because stone slabs have a high explosion resistance, but the explosion pattern DOES seem odd. Does it do the same pattern if the primed tnt is in the same block as an upward-facing slab? (Or resting atop of one.) What about on a double-slab?