Yesterday, VeriFone (a $4.2b company) launched a harsh public attack on upstart rival Square (a less-than-fifty-people, $37.5m in funding startup). You may remember Square from previous coverage on TUAW or its impressive advertising last year. So what's going on, exactly?
The basic gist of the Square service is simple. It sends you a free little reader doohicky which you plug into your iPhone or iPod touch's headphone/mic port, and you get an accompanying app for free from the App Store. When you
