From Bloomberg Businessweek, a roundup of news, trends, and ideas for small business owners

• The iPhone as a Cash Register

  Card readers that plug into smartphones, made by Square and others, are bringing new sales to small merchants

• Finding a Place for Polaroid in the Digital Age

  An Austrian startup called the Impossible Project is on a mission to revive instant film

• When It's Time to Cash Out

  Deals are bouncing back among buyers and sellers of Main Street businesses

• Business Plan Contests: Where Are the Women?

  Many groups are trying to increase female participation in competitions for promising ventures

• Report Card on Banks' Small Business Loan Pledges

  Two of the biggest banks—Chase and BofA—met their 2010 goals, while Wells Fargo missed its target

• Slide Show: America's Most Promising Startups

  Profiles of new companies that embody the creativity and resilience common among today's entrepreneurs

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