This report presents statistics on how Association of Research Libraries (ARL) member libraries spend money on electronic resources. This report indicates that 108 ARL libraries purchased 25,006,758 electronic books. In 2006-2007, there was an ARL median of 243,725 acquisitions of electronic books (this includes one institution that purchased 801,640 electronic books). ARL libraries reported spending a total of $26,387,282 for electronic books in 2006- 2007. A total of 787,625 virtual reference transactions were recorded by 99 ARL libraries. Seventy-three ARL libraries reported 152,083,681 log-ins to institutional networked e-resources. 116,840 total digital collections were reported, containing 79,786,819 items, which were accessed 662,537,647 times. In 2006-2007, ARL institutions reported $21,641,025 in the direct costs of digital collections personnel and $9,230,896 in the costs of digital collections equipment. The following are included in this report: (1) ARL Library Data Tables; (2) Rank Order Tables; (3) ARL Supplementary Statistics Worksheet, 2006-2007; (4) Footnotes to the ARL Supplementary Statistics, 2006-2007; and (5) ARL Member Libraries as of January 1, 2008. (Contains 4 tables.) [For the "ARL Supplementary Statistics, 2007-2008", see ED528635.]