Ok, I just got my first fixie bike, and it has a 46/16 setup (~75 gear inches?).
I quickly found out how important it is to have real brakes -- I could easily
support outlawing fixies without brakes.
There are some hills around my house that I cannot climb, even at zero mph,
because even with all my weight, I don't weigh enough to push hard enough
on the pedals.
I can easily climb these hills on my unicycle, but the uni is fixed at about
25 gear inches.
Perhaps there is a different technique for climibing with a fixie bike?