A snapshot of our current memory footprint on iOS, using Unity's built-in memory profiling tool (thanks to Sean Cooper):
Mono 59
Unity 53
GfxDriver 34.4
Textures 29.4
Animations 23.8
Meshes 16.8
FMOD 13
Profiler 12.8
Audio 11.1
Mono heap's allocator is a greedy SOB, and in practice only around 40-50% of its allocated memory contains persistent C# objects. We are going to try tweaking or modifying it soon to be less greedy, because we need the memory.
Also, the Unity heap is relatively huge now so we're going to poke around in there and see what's going in.