While my excuse for slacking on the first two resolutions is my move to a new city, this is a resolution that everyone should make every year—regardless of where you find yourself.
We all feel bad when we have to say no to a good organization that wants a donation. But, as I've said before, you feel a lot better saying "no" when you know you'll say "yes" to another worthy cause. So make a giving plan, and stick to it.
Start by deciding how much you can really give. Use Charity Navigator's tax savings calculator to gauge whether you can spare a bit more. Then make a list of issues you care about, and research who is doing the best job addressing those issues. Decide which organizations you want to donate to, and in what amounts. I always choose to give a larger amount to just a few organizations rather than small amounts to many. That way, there is less transaction cost for the organization, and I can follow the group's work to ensure my donation is leading to real change.
Making "goodness" resolutions may seem cheesy, but taking a few minutes to think about the largest impact you can make is definitely worthwhile. Feel free to borrow mine, or come up with your own and share them with me at firstname.lastname@example.org.