Research in Motion hit a milestone today, only "achievement" wouldn't necessarily be the best way to describe it. The BlackBerry maker has finally ended a long-running patent dispute with Visto Corp., paying out $267.5 million to settle the matter -- a much larger fee than the $7.7 million Visto got from Seven Networks, but conversely a fraction of the reported $612.5 million RIM paid to settle with NTP years back. With it, however, comes a fully paid license to use Visto's patents, and some of the plaintiff's intellectual property by way of transferred ownership. So now that we can move on from that dispute, who's next to take the mantle and vie for a piece of BlackBerry's pie?