When more than 3,000 IBM loyalists descend on Las Vegas' Mandalay Bay Resort & Casino for IBM's PartnerWorld, which began on Feb. 29, they'll have a lot of decisions to make. The issue resonating loudest in their heads will be IBM's claim that e-business on demand will rock their worlds and pay for their retirements. You read in our previous story that IBM chairman Sam Palmisano calls "on demand" nothing less than an "industry shift." Many partners will be wondering whether or not that's true.