Plotting implicit functions in Maxima?

An implicit function, such as x^3-2xy + y^3=0, can be plotted in gnuplot by
means of clever tricks to plot only the z=0 contour of z=x^3-2xy + y^3; this
is shown at

http://t16web.lanl.gov/Kawano/gnuplot/implicit/solve-e.html

Now I expect that something similar can be done in Maxima, by passing enough
parameters to the plot2d or plot3d commands.  But is there an easier way?
For example, along the lines of

plot2d([implicit, x^3-2xy + y^3=0],[x,-3,3],[y,-3,3]);

Has anybody out there in Maxima-land written such a beast?

Thanks,
Alasdair