Clearwire has been offering 4G hotspots for use with its WiMax network for a while—often teaming up with operators like Time Warner and Sprint—but now the company is looking to tap into the legions of folks using Apple mobile devices. Clearwire’s new iSpot offers 4G WiMax connectivity for up to eight WiFi-enabled Apple devices like iPads, iPhones, and the iPod touch, all for a no-contract, flat-rate $25-per-month access charge. And unlike AT&T’s iPhone data plans, Clear’s WiMax access does not have a usage cap.Now you can see the preview….