  A number of charmonium- and bottomonium-like meson states have been observed
that have properties that do not match well to expectations for the simple
quark-antiquark substructure suggested by the constituent quark model. Some of
them are electrically charged and decay to final states containing hidden
charmonum or bottomonium mesons and, thus, must contain at least four quarks.
Common properties of these so-called XYZ mesons are partial widths for decays
to hidden quarkonium states plus light hadrons that are much larger than
corresponding partial widths for established quarkonium mesons. I review some
recent results from the Belle experiment, including the recent discovery of two
charged bottomium-like states, the Z_b(10610)^+ and Z_b(10650)^+, that decay to
pi^+pi^- h_b(mS) (m=1,2) and pi^+ Upsilon(nS) (n=1,2,3) final states. In
addition, I present recent Belle results from a search for H-dibaryon
production in inclusive Upsilon(1S) and Upsilon(2S) decays.
