Running a remailer or Tor node, or somehow deploying crypto (opportunistic crypto if you can't do anything better) is a lot more useful than donating to the EFF, at this point.
Remember that EFF funded Tor for a year[1] to help it get started, and currently codes and releases HTTPS Everywhere [2] to increase opportunistic crypto for everyone. Your donation[3] will fund open source technological solutions, as well as legal work and activism.
Yes, but I think an individual spending 1-2h/yr running a tor node or remailer is a far greater impact than donating a marginal $25-50 to EFF. An additional node both makes the network stronger and sends a message/educates the operator on privacy issues.
I'm not convinced a marginal dollar donated to the EFF does that much right now -- EFF is great, but fairly well funded.