What would you love to work on?
profquail: If I ever had enough money, I'd love to start my own software non-profit, like the Mozilla Foundation. There's so many small bits of software that really make a difference in everyone's day-to-day life (whether you're an average Joe or a hardcore hacker) that don't ever get fully developed because there's no commercial market for them. With a few million dollars (which is enough to just work off of the interest), you could easily set up a scholarship program for talented students to do some part-time development on these projects, and it's sort of a win-win for everyone involved.