At the National Association for College Admission Counseling conference in Austin, Texas, the main subjects were college applications, entrance exams and financial aid. But, also clearly on the agenda were a deluge of corporate sponsors and vendors wooing schools for their business. Companies say the gift card drawings, happy hours and other activities are smart marketing--an unavoidable part of how business gets done. But critics say that by partaking of the perks, college officials risk being compromised by corporate influence.