The most recent report out of Diameter, a division of DoubleClick Inc. and comScore Networks, indicates that the Internet's most widely recognized sites are not necessarily the most valuable in terms of attracting online spenders. The netScore Buying Power Index (BPI) report for May ranked selected sites from key categories - Portals, Travel, News & Information - and uncovered the following results: - News & Information - Represented among the top BPI sites in this category were wsj.com (353), washingtonpost.com (272) and cbsnews.com (268). However, the "Detroit News" website, detnews.com (367) took the top position in the category …