You know that foundation that never returns your calls? The one you keep sending proposals to that never responds? You've poured over the foundation's 990-PF and its Foundation Directory Online profile. You've scoured the Web for information about its staff and giving. And everything you've found gives you reason to believe that if the good people at the foundation would just read your proposal, they'd want to invest in your organization. But you're still hanging on the telephone. Before you throw in the towel and decide to invest your time elsewhere, here are some things to keep in mind