I’ve been impressed by my Kona Wah Wahs so far. About as thin as you can go but feel very solid.

The Nanos are sensibly thin… Though not as grippy as some, so folk that think that matters might not like them so much.

I’ve got a set of Outland CNCs which are thinner, but also fairly nasty underfoot IMO, you’re standing right on the axle housing rather than on pins. Doesn’t mix well with stiff soles (nearly ended myself riding down glentress in my steel toecaps!) and in soft soles you can feel every line and bump (not in a good way). Also the CNC work leaves ridiculously sharp edges everywhere, brings new terror to pushing the bike around the garage.

MG1s are good, but not thin, no.

Loving my new Twenty6 Prerunner pedals (they replaced a set of MG1’s)

Much thinner than the MG1, about the same weight and oodles of grip. The set I’m running have regular pins instead of the dangerous standard hollow ones. The 2011 pins look a big improvement so I will probably order a set from the US.