IndieGoGo has the concept of Perks – incentives for people to contribute, these might be simply emotional: "We'll love you forever and you'll feel warm and fuzzy"; they might entitle donors to access to early product "Get a DVD of the rough-cut of our movie"; or something else connected with the project, t-shirts, high-res images, etc. It really can be anything you can give to people. You then associate levels of perk with levels of donation, so the ones for $100 are cooler than those for $10.
I'm having a bit of a creative/imagination failure about what I can offer here. Last year we sent postcards to everyone who made a donation (and gave us a postal address) I'd like to do that again, but it might be nice to have some way of expressing gratitude at the very low level as well as higher up.
So what would *you* want? What can I give you, associated with this project that would encourage you, or people you know to make a donation? No promises of course, and I can keep it without perks until I have some good ideas, but I'd quite like to add something in.