Nice list, Chris. +1 from me as well.
Very useful effect but with a pretty outdated interface. I was using it just last week to make a flowing/ribbon texture for some cartoon smoke and noticed some ugly artifacts when the Mesh Warp handles are pushed around to extreme values. Looks almost like the geometry it's creating (?) is intersecting itself in an ugly way.
Here's a screen shot. Note the little jagged triangles:
Would also be nice if it did some anti-aliasing in these cases.