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Passing information through channels not explicitly intended to carry that information is called a covert channel attack. Lots of links from the wikipedia page:

http://en.wikipedia.org/wiki/Covert_channel

It's important to realize that any system of any size will be packed with covert channels; the thing to do is try to identify them all and drive their bandwidth down to an acceptable level.

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If you have organized group you can probably use methods like codebook with Huffman coding to reduce message length a lot. Plain text is very sparse form of communication, compared to good codebook which suits the needs. Btw. This is over 20 years old stuff. MUDs in very early 90s were used for all kind of communication. - Nuff said. Also utilizing chaffing and winnowing allows you to use almost any kind of service to transfer your data. You'll just hide it in the junk. Only receiver will know what's meaningful and what's not.

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