I made it - and it was good! Very good, in fact. Even though I managed to stick too much polenta and not enough lemon juice into the batter! A great gluten-free recipe.
I'm doing this Thing-A-Day project in February. My lemon polenta cake is my Day 1 contribution. See the link for a photo and a bit more information about the cake.
N.B. I replaced the caster sugar in the recipe with granulated xylitol.