Comment #2 on issue 2005 by smichr: (x**(2*y)).subs(exp(3*y*log(x)), z) gives z**(3/2) instead of z**(2/3)
http://code.google.com/p/sympy/issues/detail?id=2005
On the other hand (regarding the power substitution) if powers were always represented like (x**(1/2))**3 rather than x**(3/2) (at least internally--printing is another issue) then literal replacement would do the job with no testing other than "are the bases the same?" in Pow._eval_subs.
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