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Greg,

I really can't think of many differences; similarites are what comes to mind. Both cells and multicellular organisms are gifted with the ability to communicate (cells through the release of chemicals and signals, humans through conversation and other vocal abilities), meaning they are not passive, static beings but rather interact with their environment.  They both have the power to change things arounds them, although the extent of this varies.  I guess one difference is that cells mature and reach their "final" stage of being much more quickly than humans--they have much less wiggle room to change.  In fact, they  are "fated" to a certain part of the body to perform a certain function, whereas with humans the idea of "fate" is seen as something that inhibits growth and individual will (particularly in our country, where individuals are treated as things that can shape their own destiny and become whatever they want).