In the UK if you were a UK taxpayer you used to be able to make a Deed of Covenant when I was in. You basically guaranteed to give so much a month and then the charity could get the tax back that you had paid on the amount (basic rate tax only).
Im not sure what happens now. Ive been out too long, but I assume its the same kind of thing, as there are good tax breaks for charities here. Its only if you are a higher rate tax payer that having a record of your charity donations benefits you ( I think) - or if you are a limited company.