Supposedly hand written letters to congress are worth 10 phone calls or 100 emails from petition sites.
I like to participate in AI's prisoner's of conscience campaigns. You never know if it's going to go through, but every interview I've ever read from a released prisoner of conscience states that the letter's they recieve provides moral support that gives them a shred of hope just knowing that people around the globe are aware of their circumstance and care.
A few months ago, I got a response from the whitehouse about my concerns in Darfur, looks like it worked huh?
For real though, if everyone picked an issue and wrote to a political leader 2 to 3 times a week would we eventually see results or are these efforts futile?