Intel has used the platform of its developer conference this week to reveal a roadmap for future wireless connectivity that will take in at least three different types of broadband connectivity for PCs. Intel has long made it clear that it will support WiMAX in its next generation onboard radio chips, but is now also adding a 3G HSDPA option, in collaboration with Nokia. This will mean that sometime in 2007 top end Intel laptops will be able to work with the new 802.11n Wi-fi system, with WiMAX and with cellular networks, straight out of the box. And this time this is no fly-by night partial roadmap from one small group inside Intel, this is a straight up announcement to…