There are ways to tether for free with Android, if your device is rooted. If not, you can use
PDAnet, though it is not free. Also, the EVO will have the ability to use itself as a WiFi hotspot using the Sprint Mobile Hotspot app, and can support up to 8 devices via wireless.
__________________
"I remember, way back in the day, this site was hoppin' with members, posts, and some great development."