Parallel charing of lipos

[miniGranis]

Now that I have a more powerfull charger on its way, what do you experts say about charging lipos in parallel ?
http://www.rcgroups.com/forums/showthread.php?t=932319

I have used serial charging when running 2x 2S packs as 4S in my Revo but I am abit scared of parallel connecting lipos with different voltage to each other. A part of the idea seems to let the packs level out each other.

Any thoughts from you experts ?