I like stuff, but sometimes I don’t want to go get it. That’s my big existential crisis. How much do I want a Reuben sandwich from the deli down the street? Enough to get dressed, load up my kid, put ...

This past summer, TaskRabbit, the online marketplace letting people outsource errands and odd jobs, unveiled a feature extension for its iPhone app called “Deliver Now,” which lets users get on-demand ...