It'd be awesome if somebody started some sort of umbrella organization to file the paperwork, deal with the IRS, and maintain a board for "member" charities in exchange for a small cut of donations.
I worked at a non-profit fiscally sponsored by the Trust for Conservation Innovation (http://trustforconservationinnovation.org/), which is focused on environmental projects and takes 8% of project revenue.
I definitely recommend non-profit startups consider starting with a fiscal sponsor instead of trying to register as an independent 501(c)(3). You can always spin off later if necessary.
Also, get a pro-bono lawyer or accountant to file for your tax exempt status. Most law firms actively look for nonprofit pro-bono work to do, and you can also look for pro-bono work at law schools. I had an accountant do ours pro-bono, and in the end the actual application did not take that much time.