Dot and Cross Products

Any one know how to get a dot which is bigger than \cdot but smaller
than \bullet? I need this to represent the dot product of vectors in
mathematics. And how about a heavier version of \times, to represent the
cross product of vectors? Can I get this by doing \times in bold? (I'd
test this right now, but I'm not at the moment at a machine with LaTeX 
installed.)

Bruce Pourciau