Moving ylabel using set_position

I am encountering difficulties with the ylabel for plots that I
create. The label is placed over top of the tick mark labels on the y
axis. I have attempted to move the label using the set_position and
set_x commands. In this way, I have been able to move the label in
the y direction but not in the x direction. Essentially, I have been
unable to move the label to the left of the tick marks.

I am using the Enthought Edition of Python 2.3.3. I have matplotlib
in interactive mode using backend WX. I chose this configuration
because it seems best suited for use with PythonWin, which provides me
with autocompletion capabilities.

Any suggestions for resolving my problem?