Salesforce Mobile, RoamBi Visualizer, the eBay Profit Calculator, Invoice Makers, Day Tracker, Bid Estimates — they’re but a few of the growing number of apps now available for small business owners on the iPhone App Store, according to Riva Richmond (online.wsj.com). Says iphonebootcampnyc.com dveloper Jonathan Sarno, “For the road warrior, the iPhone is perfect.