According to Hitwise:
Of the top 500 unique search terms used in visits to shopping and classified sites, 86.7% were related to corporate brands, 10.8% were related to generic product names, and 2.5% were related to product brands. The fastest growing shopping categories were grocery & alcohol, books, computers, sports & fitness, and flowers & gifts, Hitwise says.

According to comScore:
Of the 25% of consumers who purchased a consumer electronics or computer product after searching online in the first quarter, 92% made their purchase offline. Of the 8% that bought online, the “vast majority” made their purchase in subsequent online sessions.

ComScore also found that generic product terms accounted for 70% of search volume for consumer electronics and computer products and for 60% of search-to-purchase conversions. In contrast, it found that branded terms accounted for 30% of search volume but 40% of search-to-purchase conversions.