Current webcams of McKinley are difficult (but not impossible) to come by. Various cams in Anchorage show the mountain on clear days. The cams that are checked the most are the FAA ones.
On a clear day you can see McKinley from the ACSyellowwpages in Anchorage. You get the FAA cams for all of Alaska here. (backward links)
North Runway at McKinley Airport (breakout of frame)
South View at McKinley Airport (breakout of frame)