Amazon is nipping at Netflix's heels. While Netflix dominates the streaming video market, Amazon had made steady strides in recent months, according to a survey of more than 1,100 consumers in North America conducted by 451 Research's ChangeWave service. About 82% of respondents said they used Netflix to watch paid online video in September, down a tad from 84% in February. Amazon, however, rose to 22% from 17% earlier in the year. About 16% of respondents use iTunes, about the same as in February, and 8% used Hulu Plus, up from 6% in February.