Go work in them.<p>Most of us could probably spend a single day in the office of a company in a different industry and pick out a handful of ideas on ways they could improve their processes, or speedup tasks, or cutout waste.  Not all of those ideas will require a technology-based solution, but surely a few of them will.<p>If you really want to find good problems to solve, try working as a temp for a few weeks.  Ask lots of questions and make notes, I'm sure you'll find plenty of work to do.<p>Maybe that's a good startup idea right there; build a site where businesses can post their problems, procedures, workflows, painpoints, etc, and professionals can comment on them, offer suggestions, either using existing solutions (technical or not), or try to make business connections ("we can build that for you").