Okay, let’s tackle this. So David Hall has a diverse set of skills that are in demand, especially in the e-commerce and information management spaces. His experience with technologies like PHP, XML, and SQL is valuable, but not extremely rare. Integration and analysis skills are also useful. Considering his skills and experience, I'd estimate his hourly rate to be around $125, which is in line with average rates for IT professionals in New York. This rate is slightly below the national average for someone with his skill set, but it's still a competitive rate considering the cost of living in NYC.