Josh and I spent a day working the Under the Radar conference last week (see all stories). Actually, Josh was working; I was onstage hustling start-ups on and off the stage. We saw about 40 business-related Web 2.0 companies. Most of them were very early-stage, so you might not want to entrust your business to them. But there were several apps that were more developed, and a few that are worth looking at even though they're not.