But here is a very serious piece of advice for the future: It would have been nice if the anti-sw-patent campaign had acknowledged receiving my contribution in some way soon after I sent it. A short e-mail saying "thank you" would have been sufficient. The mail I am now responding was the first indication that my contribution did not disappear into a black hole (which it could have, given the uncertainties of electronic transfers)...Ok, it was not smart to misconfigure that paypal account so that it did not send any confirmation messages. Other things that went wrong: six membership fees were debited doubly in November 2002 and five paypal GBP donations bounced in August 2003. One more persistent problem is, that depending on the transmission procedure, in the bank listing I sometimes have postal addresses and sometimes not even those (although of course detailed account info).
Enough of whining, it is our current policy to send out paper receipts for amounts >= EUR 50.01 by default (and you should have received one if you gave an address while donation). The most robust way to track any donation is just to donate an "funny amount" (eg EUR 25.17 instead of EUR 25.00) and spot it later the anonymized ledger. Note that because bank transfers may take two weeks and the list is also only updated biweekly this may take up to four weeks to show up, but after that you may flame^H^H^H^H^H bugreport as much as you want ;)
Of course, an even nicer way to track your donation is either to make a nice comment or to make it public.