i'd say henin has spent alot more time with weights than martina. henin is probably stronger than hingis. i find the henin/hingis comparisons interesting but i think kirilenko has a similar type of game, similar build (thin, not really short but you wouldn't say she's tall).
and i agree that justine throws her body into it more than hingis. when justine changed her serve she put a lot more leg power into it, and when she goes for a winner off the ground she throws her whole body into the shot. but i do think hingis in her current state can still be more effective on court, her main problem isn't that she can't hit with decent power, it's that she won't. she grew up playing the percentages that's what her game was all about, and unless she is willing to give up those percentages more often and take a bit more risk in her game i don't think she's going to be able win slams.
Go the aussies! stosur!!!
and good luck russians: dementieva, safina, kirilenko, sharapova, kuznetsova, bovina, zvonareva, dushevina.
also good luck to: azarenka, lucic, sprem, vakulenko, vaidisova, safarova, ivanovic, groenefeld, mirza, krajicek, kvitkova, larcher de brito, lisicki.