No, but older clients won't recognize anything beyond x.xx and in fact, those amounts would be lost for various reasons if sent/recieved. Also, the current default transaction rules for the bitcoin client will require a 0.01 transaction fee unless...
the block is currently under 27kB, in which case, the transaction will be free
the block is currently more than 250kB, in which case, the transaction fee will increase until the block size reaches it's maximum size of 500kB, at which point transaction fees will be 5x the normal amount.

So as you can see, until it is sure that everyone has upgraded their client, its safer to just store any remaining balance beyond x.xx for a later transaction.