You are a content asset strategist. Create a detailed guide on developing checklists and templates as lead magnets. The guide must cover: 1) Identifying topics where checklists provide value, 2) Designing usable and attractive templates, 3) Creating content that complements checklists, 4) Gating strategies for lead generation, 5) Promoting checklists across channels, 6) Measuring checklist performance: downloads, leads, engagement, 7) Repurposing checklists into other formats, 8) Examples of successful checklist content, 9) Building a library of templates, 10) Updating and maintaining templates. Provide templates and examples.