The first line of defense is simply to up-vote posts like this on HN and Reddit, as well as posting to Twitter and Facebook. The more people who know about it, the more fuss we create. I know that's not much, but it's how we've beaten greedy initiatives like this in the past (SOPA).

I agree with you though, if it were made dead simple to contribute in some way towards an initiative against this specific bill and others like it, I'd of course donate.