Squareup is brilliant! So handy — I would say even crucial — for flea-market vendors, Craigslist sellers, at garage sales and for other small business needs.

The tiny card reader that plugs into your smart phone via the earphone jack is free. All you pay are transaction fees (which you do anyway when you accept credit cards). There’s no contract – just pay as you go.

[youtube]http://www.youtube.com/watch?v=3BP5ax1qs5o[/youtube]