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I am always recommending to people that they use parallel charging (of LiPo batteries ONLY; NOT NiCad/NiMH, etc), so here is a bit of info. on the matter:
(the below is a post I wrote, copied, pasted, and modified from here: http://www.rcdiscuss.com/showthread.php?18137-Can-you-charge-more-than-one-battery-at-a-time&p=244025&viewfull=1#post244025)
Article moved to here: http://electricrcaircraftguy.blogspot.com/2013/01/parallel-charging-your-lipo-batteries_22.html