  We review some aspects of Nambu mechanics on the basis of the works
previously published separately by the present author. Main focuses are on
three themes, its various symmetry structures, their possible relevance to
string/M theory, and a Hamilton-Jacobi like reformulation. We try to elucidate
the basic ideas, most of which were rooted in more or less the same ground, and
to explain motivations behind these works from a unified and vantage viewpoint.
Various unsolved questions are mentioned. We also include some historical
account on the genesis of the Nambu mechanics, and discuss (in the Appendix)
some parallelism of various ideas behind the Nambu's paper with Dirac's old
works which are related to the description of vortical flows in terms of gauge
potentials.
