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I have to admit that I really have enjoyed JT65 for tracking down some relatively rare DX that I otherwise would have a heck of a time snagging. We're talking <500mW with a short random-wire antenna thrown into some trees. All 50 states and 105 countries on every continent.

And, as far as utility is concerned, if a group of preparation-minded hams could develop a CEOI (communications-electronics operating instruction) for a private net, some very effective communications could be exchanged during a "disaster" at very, very low power with very, very stealthy equipment (low enough power where it would be extraordinarily difficult for fox-chasers to be able to catch them). If you catch my drift.