Collegiate Housing and Infrastructure Act of 2007 - Amends the Internal Revenue Code to allow tax-exempt charitable or educational organizations to make collegiate housing and infrastructure improvement grants to certain tax-exempt social clubs (e.g., college fraternities and sororities) so long as all of the active members of such clubs are full-time students at the college or university with which such clubs are associated. Defines "collegiate housing and infrastructure grants" to include grants to provide, improve, operate, or maintain collegiate housing.