Subject indexes were an important step forward for books because they enabled the comparison and correlations of information without extensive reading, re-reading and memorization. In this short paper, we focus on the user interaction and usage scenario of a new system called ScentIndex that enhances the subject index of an eBook by conceptually reorganizing it to suit particular information needs. Users first enter information needs via keywords describing the concepts they are trying to retrieve and comprehend. ScentIndex then computes what index entries are conceptually related, and reorganizes and displays these index entries on a single page. ACM Classification Keywords H.5.2 [Information Interfaces and Presentation]: User Interfaces-Graphical User Interfaces; H.5.4 [Information Interfaces and Presentation]: Hypertext/Hypermedia--Navigation; User Issues H.5.m. [Information interfaces and presentation (e.g., HCI)]: Miscellaneous General Terms: Design, Human Factors. Author Keyword...