Although the iPad apparently lacks Flash, that doesn't mean that rich media won't be able to function on the device. Yesterday, we heard that Brightcove will stream video in an HTML5 video player as opposed to a Flash unit. And today, Greystripe is announcing that it will be bringing its rich media iFlash ad units to the iPad in May. Greystripe has been allowing advertisers to use Flash-like technologies in their iPhone advertisements for some time now.