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You don't even need a 3rd party app from what I'm gathering - you can tether through USB to provide internet for a device.
Can someone with an EVO confirm this?
Yes - It's been heavily discussed here:
http://androidforums.com/htc-evo-4g/85263-anyone-evo-try-tethering-vita-pdanet.html
And
http://androidforums.com/htc-evo-4g/85782-3g-wimax-tethering-speed-test-results.html
Please try using Search next time.

Can't Sprint tell if you're tethering unless your device is rooted? If so, I would think they could charge the $30 a month to your bill. I'm not saying they would do that, just that they could.