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@Rhodrich
I have to say that I was always quite sceptical of Jan Heine's research that says that a wider tyre at lower pressure is more puncture resistant, but given that I've been commuting on 32c tyres for the past 2000 miles, which do not feature any sort of puncture protection layer, without suffering any unwelcome deflations, I'm thinking that perhaps he may have a point (cue a nasty puncture on the way home now!)
The tyres in question are early 1990's Conti Top Touring ones, in 27 x 1 1/4" format that I bought new back then, and then hardly used for the next 20 years. Thinking about it, on my 15 mile round trip commute to school, back in the 90's on 27x 1/1/4 tyres, I can't remember ever once getting a puncture, despite there not being puncture protected tyres back then.
My thoughts are that anything that's sharp enough to puncture such tyres will do so, whether or not there's a puncture protection belt, unless you've got a layer as thick as those in Marathon Plus tyres. The thin aramid/vectran etc ones don't really do much.
I'm with Mr Scoble. Wide supple tyres are the way forward....