Astro.com has a section under their Extended Chart Selection (linked in their sidebar), called "Pullen Astrolog" where, after having keyed in your birth data, you can go to Pullen's "Simple chart delineation" and scroll through a huge amount of of information about your natal chart. Eventually, after scrolling through reams of it, arrive at a group of statistics where the "strengths" of planets and the 4 elements in your natal chart are painstakingly calculated, expressed as percentages. This method didn't give results exactly as expected for me. Percentage-wise Mercury was "strongest" planet, Pluto next, then Uranus, Mars and Jupiter. "Strongest" sign Scorpio (huh?), then Aquarius, Aries, Pisces. Elements in order of importance natally: Water then Earth, Fire, Air.
Mercury's strong position near to the descendant angle, natally, accounts for its prominence, and Pluto's natal first house position made it runner-up, I guess. Not sure how Scorpio managed to beat the rest, sign-wise, though.
How about you - any surprises?