My husband does pick-ups and deliveries for me and goes to the bank and stops at Staples, that type of thing. My daughter sorts/organizes paperwork for two of my clients and creates large, green ledger sheets (can't get her to work in Excel yet) adding up their business income and expenses and itemized deductions and office-in-home items and anything else she uncovers with a tax consequence. She also files. If your clients overlap, perhaps he could schmooze with the waiting clients. He could answer the telephone, screen your e-mails, serve coffee, file, etc.