One of the uses NGOs are making of Facebook, etc. is as an avenue for soliciting support from members and allies. As many features like that as you can enable will, I suspect, be useful:

* online donations
* campaign tools for groups/organizations
* standing tip jars for groups I support as a user
* maybe online stores? (if done ethically and with care)
* fundraising contest support

Thank you, Alex. Yes, we hope to have some of the features you have suggested on WE. One small feature we had at the time of launch was a donate button on the org. profile. however, this wasn't really helpful as the button led the user to a resource page. We think it'll be much more useful for organizations to be able to directly embed their donate buttons on their profile. We would also like to work on better linking people with organizations.