Shopping research site Become.com has added integrated comparison-shopping and several other features intended to simplify and expedite online shopping, and has therefore become more like Shopping.com, Shopzilla and other shopping search engines, reports SearchEngineWatch. The main difference between it and other shopping search services is its ability to research products using its web search index for information and then "seamlessly switch" to a comparison-shopping tool. Become.com launched in April with an index of more than 3.2 billion pages of shopping-related information from more than 40 million web sites.