It's also worth noting that paper and phone calls are a lot more hassle than email. All those 'email your councillor/senator/mayor/whatever' campaigns are ineffective because the people who take the time to call or mail in a letter are likely to be 10 times more pissed off (and express it) than those that simply email.

Also, remember. Paper builds up. If you've got friends who oppose the bill then get them to write at the same time. Get a stack of letters and mail them together.

Emails can be deleted, and phone calls can be ignored. 100 letters being dropped off by the mail man, that's gonna be a problem.