sidenote: If there is a database system via .gov in USA that has an API to verify 501(c)(3)/non profit status we could link it to coinmap.org or other system...but now we're talking bureaucracy-bomb: WOW!  There should be  a way to verify address and EIN, making sure an org is actually non-profit.  We would essentially be adding a plug-in to a donation website that verifies via the feds that it is legitimate.  It also opens a hole for hackers, so it would need to be a pretty large/secure system.  I can't set up a mom-and-pop Tax Exempt-verified BTC donation website, that's for sure.  Bitpay has the groundwork already laid out though.  They had me email all sorts of documentation before they secured our status as an NPO.

Coinmap.org was the first place I registered our NPO (El Camino Real Academy in Albuquerque).  A comprehensive and automated list may be difficult currently as there is no automatic way to differentiate wallets nor a central authority to verify authentic non-profits/charities from other entities.  Adding a keytag similar to how coinmap works with finding BTC venues that adds the fact that the entity is non-profit/tax-exempt would be great, but requires active participation of NPOs and can be spoofed if successful.  I love the idea, just can't figure out how to do an NPO filter within the BTC ecosystem without changing the protocol itself and adding a verification system, which would be like "colored" coins which are anathema.  I'm also one of those people who immediately finds the issues/problems and just spurts them out, so I'm not saying it's impossible....I'm just seeing a lot of hurdles getting this kind of filter through, unless it is marketed and uses the social-aspect and not the technical.  Marketing NPOs is tough, I'm sure you agree...You're on to something I haven't thought of yet, but I'm getting caught up in the hurdles/weeds trying to find the gears that fit.