I would put a focus group around improving add-ons for gmail, one at a time. Though I use multiple project management tools, I still use email the most. Having a direct project/todo management tool in gmail would make the life so much easier and no one will have to go and get different accounts for different clients. They can just add a project within gmail. But it has to be at least at par with the current best. This will completely disrupt the project management tool provider industry.