I approach giving to my alma mater the same way I approach making contributions to the United Way and that's through monthly EFT (electronic withdrawl from bank account). Like N4L suggested, I make restricted contributions because I'm one of those people whom do NOT have warm fuzzy feelings towards their alma mater. My restricted gifts are made towards the Black Student Union and scholarships for Black students.
If you set it up to give a small amount montly, say $25, over a year's time that comes to $300. It may not seem like a lot but it is something.
It would be even more wonderful if you can get friends involved.