Put a flattr button on the payments page
Flattr is a way for people to make micropayments. It's not terribly well known in the mainstream, but it's well known in some of the large social movements likely to use Loomio, like Occupy and Pirate Party. It wouldn't require much in terms of dev resources - just put their embeddable button on the page. I think it would be worth doing.
I like it!
FYI we've had 2 different Flattr payments so far, and we haven't even registered an account. It's a great platform, really aimed at solving the problem of how open source software gets funded. If we can include the option without unduly cluttering the page, I would be in full support.
I agree this is a no brainer. Loomio should also join https://www.gittip.com/ too if you've not already done so, which is a very similar and great product :)

I am good with that so long as don't feel like we are confusing our options by having too many!@annaguenther will have a good feel for that