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Amazon moved aggressively to fulfill its new ambition to publish books as well as sell them, announcing that it had signed Timothy Ferriss, the popular self-help guru.

The online retailer wants voters to strike down the California law requiring the company to collect sales taxes. Wal-Mart, labor groups and other opponents could wage a costly, noisy battle against such a referendum. Escalating its fight to thwart a new levy on Internet purchases, Amazon.com says it will ask California voters to overturn a state law requiring all companies with operations or affiliates here to collect sales tax.

The team behind Diapers.com has made a new e-commerce site aimed at the other baby in the American household: the family pet. Quidsi, which is now a wholly-owned subsidiary of Amazon.com, is announcing Wednesday the launch of Wag.com, an e-commerce site selling pet-related products.