I think Ben gave very useful advice. Identifying your task list is what I recommend to anyone in your shoes. I would just add that it may not be possible or the best idea to delegate within your existing team of developers. Instead you may want to ask what tasks from your day-to-day are the ones that you provide the most value to (or what you want to be doing). Bringing someone in to help manage your growing overhead may be worth considering.

If you aren't at the point that you want to bring someone in, you may also want to try adopting some team management techniques from an agile methodology. This could provide a huge benefit by allowing a huge portion of daily tasks to be team driven. You can step back and just focus on the product backlog prioritization and maximizing value.